Simply paying $20 to go to a party, does not make someone a member, They must fill out a membership form, and submit it. If non members want to attend, I think thye need to join first, not at the door. I will check this, but this is my opinion. If this is a members only party, then only current members should attend. I also feel that since there will be drinking, only those over 21 (and prove it) should be allowed to attend.