It's not very conducive to a party-style game, but I usually organize LARPs for one player for their birthday. I recruit actors and locations, set meets at nightclubs, and have a designated portion with paintballs or foam larp weapons. I know a lot of people in the costuming, theatre and gaming scene, so it usually goes for about two hours and involves hacking a system/stealing a commlink (easier than ever with smartphones and all their apps), a shootout, a B/E into a location, and even a simulated car chase once (I contacted local law enforcement and got authorization for live-theatre displays, as well as the combat scenes.)
The most important thing, more than it being entertaining, is that it be safe. Always safe.