The Movie Timeline - be obsessive, be very obsessive
The Hangover - timeline
Stu starts dating Melissa. (Los Angeles, CA)
June: Melissa hooks up with a bartender on a cruise.
Friday 31st July: Doug Billings, Phil Wenneck, Stuart Price, and Alan Garner go to Las Vegas for Doug's bachelor party. (Las Vegas, NV)
Saturday 1st August: Phil, Stu, and Alan wake up with hangovers and discover that Doug is missing. (Las Vegas, NV)
Sunday 2nd August: Stu, Phil, and Alan find Doug on the roof of Caesar's Palace. (Las Vegas, NV)