Hi LongLivePunk
You can try to look at the prog of the Sommercasino :
http://www.sommercasino.ch/ even it's more something like metal, hardcore bands, it's in a cool place (I still recommand you to go at the Zatokrev gig, it's really a good band !)
Otherwise you can look at Z-7 Konzertfabrik :
http://www.z-7.ch/start.php It's in Pratteln, a small town near Basel !
Here too, but I think, it's more cultural :
http://www.kaserne-basel.ch/
That's all I know about Basel ...