I'm an admin of a fairly large group, but this particular event is severely space limited, so I've said that only the first 12 people that RSVP will be able to come. Normally, this isn't a problem but sometimes people bring friends that aren't part of the group, so they can't actually RSVP on it.
This means I have to manually track how many people are coming and in what order they did it so I can fairly decide who actually gets to come. It would be pretty helpful if there was an easy way to do this.
Best Answer
There is no guaranteed way to do this via Facebook, unfortunately.
You can infer some things about RSVP order via the guest list, but you have to realize a few things:
If you click to see who is "Going" on an event, it will list people (as applicable) in the following order:
If it is very important to know the true, reliable RSVP order, and you won't be able to check often enough to ensure that you catch it at 12 people, you are probably better off using a different tool.