Barcelona Marathon

The Barcelona Marathon runs throughout the city and passes several of Antoni Gaudi's designs. This is perhaps one of the most popular ways for the athletic visitor to see the sights of the city at a brisk pace!
http://www.barcelonamarathon.com 

More Festivals in Barcelona
11th September, Diade Nacional de Catalunya (Catalonia National Day)
15th August, Festes de Gracia
24th June, Verbena de Sant Joan (St. John's Day)
24th September, Fiesta de La Merce
25th December, Christmas
2nd December, Fiesta de Santa Llucia