Wanda, seriously? lol you just listed things that would keep people busy for a month. Not that I can talk, we both have a tendency to take on a lot but I've managed to not forget my birthday so far ;)
We've been through this before, you smile and say thank you because you totally deserve them because you are awesome. Try my trick; no planning just wing it. Text people or pop a post up on the net - if they're busy they can change their plans! Simple x