Las Fallas
If you want nonstop nightlife at its frenzied best, come during the climactic days of Las Fallas, March 15–19 (the festival begins March 1), when revelers throng the streets to see the gargantuan ninots, effigies made of wood, paper, and plaster depicting satirical scenes and famous people. Last call at many bars and clubs isn't until the wee hours, if at all. On the last night, all the effigies but one (the winner is spared) are burned to the ground during La Crema, and it seems as though the entire city is ablaze.