A Flashmob Wedding!!!
Guests will be informed of the 2-3 day period over which my wedding will take place so that they can plan for time off in advance, but they will not know the location. Then, precisely 24 hours before the ceremony, My hubby and I will reveal the location of the wedding (likely still within the continental US, but no guarantees). At this point, the wedding guests will commence their epic mission of making it to my wedding (by whatever means available) within the given timeframe in a literal race to the altar.
Pretty great, huh?