To paint the town red is an idiom which means to go out and enjoy yourself in the evening, often drinking a lot of alcohol and dancing your little socks off.
I’ve been wondering if this idiom comes from Bunol and the La Tomatina festival. What do you think?
That would be a lovely source for the expression, wouldn’t it. I’ve googled around but no-one seems certain where the phrase came from. Possibly America, but I prefer to think it came from La Tomatina!