Sorry Don Falcon, you can not declare a party and decide to have it on the same day you posted the announcement for it. You have to give people at least a week's notice, and it is best if you hold a party on a Friday night when most people are out of school / work.
Let's start with the basics.
For a party, we need the following:
1) a room
2) a theme - I guess the theme is 5000 / mafia
3) music
4) a host
5) invites - I can send these out