WOP Challenge Bilbao-Bizkaia 2026-10-24 Trail Relay Bilbao / Spain Visit Event Website → About This Event Location Bilbao Country Spain Date 2026-10-24 Distances Trail Relay Why This Event Charity trail relay supporting neurodegenerative disease research with FULL (36 municipalities) and 1DAY (50K) formats. More Runs in Spain View all runs in Spain