Oh yes! RSVP's (or lack of RSVP'ing) is my pet hate. If you say you are going, then go unless you have a very good reason.

I also hate how people don't RSVP or just say "maybe". Look in your calendar and make a decision. You either can make it or not. People only say maybe just in case something better comes up. Non-committers! I hate chasing people up too!