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        • Empower communities to look after their local rivers:

          We mobilise thousands of volunteers every year, working along the riverbank to transform neglected rivers into areas that everyone can use and enjoy.

        • Restore the capital’s network of rivers through the power of nature

          We work to clean and green the capital’s 400-mile network of rivers through innovative solutions to boost biodiversity and restore nature.

        • Build a climate resilient London

          We help to build more engaged communities and healthier rivers better able to adapt to the impacts of climate change, now and into the future.

        • Empower communities to look after their local rivers
          We mobilise thousands of volunteers every year, working along the riverbank to transform neglected rivers into areas that everyone can use and enjoy.

        • Restore the capital’s network of rivers through the power of nature
          We work to clean and green the capital’s 400-mile network of rivers through innovative solutions to boost biodiversity and restore nature.

        • Build a climate resilient London
          We help to build more engaged communities and healthier rivers better able to adapt to the impacts of climate change, now and into the future.

        • Improving Rivers
          • Backwater restoration in the Maidenhead to Teddington catchment
          • Bathing waters – Reclaim Our Rivers
          • Cator Park, London Borough of Bromley
          • Understanding our rivers through connecting communities to waterways – Catchment Partnerships
          • Chinbrook Meadows Wetlands
          • Community Action for the Cut
          • Greenwich Natural Flood Management (NFM) Project
          • Marsh Dykes & Thamesmead Catchment Improvement Project
          • Oxford Rivers Project
          • Quaggy Habitats – Capel Manor Project
          • Queensmead Recreation Ground, London Borough of Bromley
          • Rewilding the Rom
          • River Beck Restoration
          • River Biodiversity Net Gain Units
          • Road run-off
          • South Essex Catchment Partnership
          • The River Ravensbourne and Glassmill Pond
        • Connecting Communities
          • Beckenham Place Park East – River Ravensbourne
          • Become a Citizen Scientist
          • Chestnuts Field
          • EMPOWER Rivers
          • Plasticblitz
          • Action for Silk Stream
          • Thames Connections
          • Thames River Watch
          • The Roding Rises
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          • Citizen Science
            • Leading Action for Healthy Rivers: Thames21’s flagship training course
            • Welsh Harp Environmental Education Centre
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23 events found.

Events

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  • May 2026

  • Wed 27

    London Rivers Week 2026: Evening stroll along River Crane at Mill Road, Twickenham

    May 27 @ 6:30 pm - 8:00 pm
    Crane Park, TW2 5HA Mill Road

    Join Friends of the River Crane (FORCE) for this fantastic evening walk along the River Crane. This FREE guided walk will start at Mill Road...

  • Thu 28

    London Rivers Week 2026: The Yeading Brook Clean Up

    May 28 @ 9:30 am
    Headstone Manor Recreation Park, Pinner View, Harrow HA2 6PX Pinner View, Harrow, London, United Kingdom

    Join The Friends of Headstone Manor Park for a free Yeading Brook Clean Up event as part of London Rivers Week 2026. The starting point...

    Free
  • Thu 28

    London Rivers Week 2026: Action for Silk Stream – River Action Day

    May 28 @ 11:00 am - 3:00 pm
    Rushgrove Park, Western Entrance Rushgrove Park, Rushgrove Avenue

    Join Thames21 for our free Action for Silk Stream monthly volunteering days as part of London Rivers Week 2026. Please book here: Action for Silk...

  • Thu 28

    London Rivers Week 2026: Deptford Creek Fish Survey [FULLY BOOKED]

    May 28 @ 1:30 pm - 3:30 pm
    Creekside Discovery Centre 14 Creekside, Deptford , London, United Kingdom

    Want to learn more about the aquatic life that calls Deptford Creek home? Join Creekside Discovery Centre on a FREE fish survey as part of...

    Free
  • Thu 28

    London Rivers Week 2026: Creekside Low Tide Walk

    May 28 @ 6:00 pm - 8:00 pm
    Creekside Discovery Centre 14 Creekside, Deptford , London, United Kingdom

    Join Creekside Discovery Centre for a free Low Tide Walk in Deptford Creek as part of London Rivers Week 2026. With the help of our...

    Free
  • Thu 28
    London Rivers Week 2026 Kyd Brook Walk

    London Rivers Week 2026: The Kyd Brook: Living alongside a suburban river 1920s-2020s. A walk through Petts Wood [FULLY BOOKED – Waitlist Available]

    May 28 @ 6:00 pm - 8:00 pm

    Join urban sociologists Emma Jackson and Louise Rondel and local historians Mel Wright and Andrea Stevens for a FREE guided, London Rivers Week 2026 walk...

  • Thu 28

    London Rivers Week 2026: Poetry Open Mic Night – Rivers Edition [FULLY BOOKED]

    May 28 @ 6:30 pm - 9:30 pm
    Putney Public Library

    Join Poets in Putney for a free poetry session celebrating London Rivers Week 2026! The event will be held at The Hall, Putney Public Library...

    Free
  • Fri 29

    London Rivers Week 2026: Action for Silk Stream – Wildflower Identification Workshop

    May 29 @ 10:00 am - 1:00 pm
    Lyndhurst Park Edgware

    Join Thames21 on a free Beginners Botanical Walk as part of London Rivers Week. We will identify wildflowers and plants growing along the banks of...

  • Fri 29

    London Rivers Week 2026: Perivale Park Litter Pick

    May 29 @ 10:00 am - 2:00 pm
    Pear Tree Bistro Stockdove Way, Greenford

    Join Thames21 for a free community litter‑picking session along the River Brent in Perivale Park as part of London Rivers Week 2026! This hands‑on event...

    Free
  • Sat 30

    London Rivers Week 2026: The East London Garden Society Boat Trip [SOLD OUT]

    May 30 @ 10:00 am - 5:00 pm
    Three Mills Park, E3 3DU

    Join The East London Garden Society for a boat trip as part of London Rivers Week 2026. Hop on board for a chill boat trip...

    Free
  • Sat 30

    London Rivers Week 2026: Source to Sea: Walking the Ravensbourne (Part 2)

    May 30 @ 10:30 am - 1:30 pm
    Ravensbourne Rail Station

    To mark London Rivers Week, join Creekside Discovery Centre on this special two-part free walk following the Ravensbourne River from its source to where it...

    Free
  • Sat 30

    London Rivers Week 2026: Thames Tideway walk – Vauxhall Bridge to Blackfriars (two sessions) [FULLY BOOKED]

    May 30 @ 11:00 am - 1:00 pm London Rivers Week 2026: Thames Tideway walk – Blackfriars to Vauxhall Bridge (two sessions)

    Get your walking boots on and join this FREE guided walk along three public realm sites of the Thames Tideway Tunnel - their design, engineering...

  • Sat 30

    London Rivers Week 2026: Coming into {{Contact}} with a River you cannot {{Touch}}

    May 30 @ 11:00 am - May 31 @ 5:00 pm
    Metroland Cultures 91 Kilburn Square

    How can we come into contact with rivers we cannot touch? Join artist, researcher and London National Park City Ranger Becky Lyon for a free...

    Free
  • Sat 30

    London Rivers Week 2026: Make Like Morris – A Wandle Blooms Linoprint Workshop

    May 30 @ 12:00 pm - 3:00 pm
    Poulter Park 131 Peterborough Road, London

    Channel William Morris by the River Wandle! Carve & print your own floral tile with South East Rivers Trust at this free outdoor workshop for...

    Free
  • Sat 30

    London Rivers Week 2026: Thames Tideway walk – Blackfriars to Vauxhall Bridge (two sessions) [FULLY BOOKED]

    May 30 @ 2:00 pm - 4:00 pm London Rivers Week 2026: Thames Tideway walk – Blackfriars to Vauxhall Bridge (two sessions)

    Get your walking boots on and join this FREE guided walk along three public realm sites of the Thames Tideway Tunnel - their design, engineering...

  • Sat 30

    London Rivers Week 2026: Barnes Common Riverside Walk [FULLY BOOKED – WAITLIST AVAILABLE]

    May 30 @ 2:00 pm - 4:00 pm
    Barnes Bridge

    Join Barnes Common Limited for a free riverside walk as part of London Rivers Week 2026. A walk along the Thames Path via Leg O'Mutton...

    Free
  • Sun 31

    London Rivers Week 2026: Introduction to MoRPh CSci training event

    May 31 @ 9:30 am - 5:00 pm
    4th Ruislip Scout Hut West End Road

    As part of London Rivers Week, Cartographer are hosting a free, open, in-person 'Introduction to MoRPh' training. This one-day training course will teach you how...

    Free
  • Sun 31

    London Rivers Week 2026: Morden Hall Park Family Craft and River Dipping Experience Day

    May 31 @ 10:00 am - 12:00 pm
    Morden Hall Park Morden Hall Rd, Morden

    Celebrate London Rivers Week with a FREE fun, hands-on morning by the River Wandle! Join Thames21, the National Trust and its Urban Rangers, and creative...

  • Sun 31

    London Rivers Week 2026: Brown Girls Summit Walk (WOMEN-ONLY WALK)

    May 31 @ 10:00 am - 1:00 pm
    Putney Bridge Station Putney Bridge Station, London, United Kingdom

    CLICK HERE TO REGISTER Join Brown Girls Summit for a free women-only guided walk as part of London Rivers Week 2026. Brown Girls Summit is...

  • Sun 31

    London Rivers Week 2026: Guided Walk Exploring the Industrial History of the River Wandle

    May 31 @ 12:00 pm - 1:30 pm
    Mitcham Tram Stop London Road, London

    Led by John Sheridan of the Wandle Industrial Museum, this FREE event starts at Mitcham, lets you view sections of the River Wandle, and finishes...

  • Sun 31

    London Rivers Week 2026: Honouring Mama Osun

    May 31 @ 1:30 pm - 4:00 pm
    Old Swan Wharf at St. Mary's Church, Battersea. St. Mary's Church, Battersea Church Rd,, London, United Kingdom

    REGISTER HERE! We enjoyed it so much last year that the Annual Osun River Ritual organisers and Thames21 are again inviting you to this special...

  • June 2026

  • Thu 25

    River Action Volunteer Day – Silkstream Park, Barnet

    June 25 @ 11:00 am - 3:00 pm
    Silkstream Park

    Join us for free our Action for Silk Stream monthly volunteering days. Please book here: Action for Silk stream River Action Day - Thames21 Limited...

  • July 2026

  • Thu 30

    River Action Day

    July 30 @ 11:00 am - 3:00 pm

    Join us for free our Action for Silk Stream monthly volunteering days. Please book here: Action for Silk Stream River Action Day - Thames21 Limited...

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Thames21
THAMES21

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Main Office location (& deliveries)

The City of London,
Guildhall,
Aldermanbury Street,
LONDON EC2V 7HH

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The City of London,
Guildhall,
PO Box 270,
LONDON EC2P 2EJ

Contact us

Satellite Office

Satellite Office: 

The Lock Office,
Bow Locks,
Navigation Road (off Gillender Street),
LONDON E3 3JY

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Registered Charity number: 1103997

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