Ten days of festive rolling on (and around) the river to ring in the summer.
It launches the summer, but only every other year.
To officially ring in summer, Bordeaux' Fête du Fleuve is ten days of festivities (in 2013 it was May 24 to June 2) along both sides of the Garonne River as well as the Pont de Pierre. It includes craft fairs, open-air concerts divided between river banks, family and kids' activities, fireworks, and more. One catch: it's held only in odd-numbered years.