Join Velindre Cancer Charity for Castle 2 Castle 2026 and make strides towards Victory Over Cancer! One of our most iconic #TeamVelindre events, Castle 2 Castle’s 10.5-mile route takes place between two of South Wales’s most stunningly scenic castles – Caerphilly to Cardiff. An event full of fun, community, togetherness, and dedication – it truly is a magical day in our event calendar.