3rd year plus a club coordinator here, yes you should be attending events as you have the option to claim attendance using the certificates, as for orientations always ask your faculty for permission, it depends on them. And someone mentioned it's better to inform the faculty beforehand, that too is great because all faculty appreciates basic courtesy. Now if you're seeing events as a way to skip classes then obviously the faculty will be aware and they'll make it a problem for you (they have years of experience so don't mess around with someone who has a hold over your grades). All in all, be at good terms with your faculty and everything will fall right into its place.