Run, Cycle, Walk and Fundraise for React

Looking for charity challenge events in the UK for 2026? React offers a wide range of fundraising events including marathons, obstacle races, cycling challenges and family-friendly activities.

Taking part in charity challenge events is more than just completing a race or adventure. Every mile run, every climb conquered and every pound raised helps families caring for children with life-shortening illnesses receive vital support from React.

Each event you take part in helps React support families caring for children with life-shortening illnesses, providing vital equipment, support and respite breaks when they need it most.

Whether you want to run your first marathon, tackle a muddy obstacle course, or host a community fundraiser, there’s a challenge waiting for you.

Browse our 2026 charity events below and register your interest today.

Featured Charity Challenge Events 2026

London Marathon Charity Place – 26 April 2026

Location: London

The TCS London Marathon is one of the world’s most iconic races. React’s charity places for 2026 are now allocated, but runners who secured a ballot place are welcome to join the React Runners and fundraise what they can.

Our fundraising team will support you with:

  • Fundraising ideas

  • Training encouragement

  • Race day support

Interested in running for React in London Marathon 2027? Contact us today.

Tough Mudder Charity Challenge – Multiple UK Locations

Push yourself to the limit at one of the UK’s toughest obstacle course events.

With more than 20 challenging obstacles, Tough Mudder tests your strength, endurance and teamwork while raising funds for React.

2026 Tough Mudder Locations

  • West London – 9–10 May

  • Midlands – 4–5 July

  • Yorkshire – 25–26 July

  • South West – 15 August

  • Manchester – 10–11 October

Minimum sponsorship: £250

Perfect for thrill seekers and team challenges.

We Care Cream Tea Fundraiser – Carers Week (9–15 June)

Host a Cream Tea fundraising event during Carers Week and help raise awareness for families caring for seriously ill children.

Invite friends, family or colleagues to join you for tea, cakes and conversation while supporting React.

Theme: Building Carer Friendly Communities

A perfect community fundraising event for schools, workplaces and local groups.

Lake District Triple Challenge – 8–9 August

Location: Lake District National Park

Take on a spectacular multi-sport adventure challenge in one of the UK’s most beautiful landscapes.

This incredible challenge includes:

  • Trekking The Old Man of Coniston

  • Mountain biking through Grizedale Forest

  • Kayaking across Coniston Water

Signup fee: £89.99

Minimum sponsorship: £300

Ideal for adventure lovers and outdoor enthusiasts.

Richmond RUN-FEST Charity Runs – 12–13 September

Location: Kew Gardens, Richmond, London

Run through the stunning grounds of Kew Gardens at one of London’s most exciting running festivals.

Choose your distance:

  • Marathon – £250 sponsorship

  • Half Marathon – £200 sponsorship

  • 10K – £150 sponsorship

Join thousands of runners at this vibrant London charity running event.

London to Brighton Charity Cycle – 13 September

One of the UK’s most famous charity cycling challenges.

Ride the 55-mile route from London to the Brighton seafront, passing through scenic countryside before tackling the legendary Ditchling Beacon climb.

Minimum sponsorship: £250

A classic cycling challenge perfect for individuals or teams.

Peak District Ultra Challenge – 19 September

Location: Peak District National Park

Take on the 50K Ultra Walk through breathtaking landscapes across the Dark Peak and White Peak.

Challenge highlights:

  • 1200m total ascent

  • Highest point: 464m

  • 12-hour target completion

Minimum sponsorship: £300

Perfect for hikers, endurance walkers and ultra challengers.

Inflatable Obstacle Course Challenge – 3 October

Location: Kempton Park, Surrey

Take on the world’s largest inflatable obstacle course in this fun and family-friendly fundraising event.

Distances available:

  • 2.5K

  • 5K

Children aged 5–15 can participate with an adult, making this a great event for families.

Minimum sponsorship: £100

Santa Walk London – 9–10 December

Location: Central London

Celebrate the festive season with a 5K Christmas charity walk through the heart of London.

Starting at St Paul’s Cathedral, the route passes some of the city’s most iconic landmarks before finishing at Paternoster Square.

Minimum sponsorship: £150

A magical festive fundraiser perfect for friends, families and workplaces.

Why Fundraise for React?

React supports families caring for children with life-shortening illnesses across the UK.

Funds raised through our charity events help provide practical support for families in crisis, including: specialist equipment, education equipment, respite holidays, and end of life care

By taking part in a challenge event, you help give families some relief during incredibly difficult times.

Register Your Interest

Want to take part in one of our charity challenge events in 2026?

Our team will help you: secure your place, plan your fundraising journey, and reach your sponsorship target, and guide you every step of the way.

Register your interest and join Team React today:

react@reactcharity.org

0208 940 2575