Oh yeah, going to music festivals is a given! There are two that are worth going to most of the time.
Byblos festival: They've brought some pretty high profile people..scorpions, gorillaz, yanni etc... the city is a thing of beauty at night..I hope I found someone to share it with..:P
Wickerpark festival: non stop music, most of them are lebanese indie bands..last year it fucking really..I was jumping there for 7 hours straight.