What is "gatecrashers"

Usage examples of "gatecrashers".

He'd been hired to keep gatecrashers out of the party, not to stop whirlwinds and walking torches.

We've had some would-be gatecrashers, but the only outsiders we've invited are the ambassadors and their aides.

We get a great many would-be gatecrashers and, ah, ace groupies, often wearing outlandish costumes, so when someone cannot demonstrate an ace talent, we.