Does facebook really provide that much value add over a simple email invite? Every response you get can go into a special folder for that party. When the party is over, you delete the folder - or leave it - maybe even put it in an "old parties" folder.
Using facebook for events provides a few benefits over email:
1. You don't need to know your friends' email address
2. You can add pictures/video from the event
3. It automatically generates maps, directions.
4. People not interested in getting emails every time someone responds with "I'll bring the salsa!" can choose not to get notified.
Far too much work. The whole point of a facebook event is to be rid of the organizational administration and to be able to discover events your friends go to / invite you to in a central place.
