Parallel Windsor 2026

Be part of something truly special at Parallel Windsor 2026, the UK's most inclusive mass participation event, where everyone is welcome, regardless of age, health condition, or ability. 

By joining Team Immunodeficiency UK, you'll help support people living with primary and secondary immunodeficiencies while experiencing an unforgettable day of movement, celebration, and community. 

Choose your challenge, whether it's 100m, 1K, sensory-friendly routes, 5K, or 10K and take part your way. You can walk, push, run, or roll. There are no cut-off times, so you can start together and finish whenever suits you. 

The event is held in the grounds of the majestic Windsor Great Park & staged on the iconic Long Walk.   

The 100m & 1K runs have Windsor Castle as an impressive backdrop, with the 5K and 10K routes taking in the stunning views of the Deer Park. 

Why join Team Immunodeficiency UK? 

Empower the immunodeficiency community: your participation will provide crucial support to individuals and families facing the challenges of living with primary and secondary immunodeficiency. By running for Immunodeficiency UK, you will be helping us be there for those affected by immunodeficiency. 

Places are free, we just ask you to commit to raising a minimum of £150 to support our work. This event is a great day out for all the family, offering something for everyone.