From Longman Dictionary of Contemporary Englishgatecrashgate‧crash /ˈɡeɪtkræʃ/ verb [intransitive, transitive] INVITEto go to a party that you have not been invited to —gatecrasher noun [countable]→ See Verb table
Examples from the Corpus
gatecrash• But thousands more gatecrashed the party amid rain-lashed chaos.• Watch for the fireworks, or gatecrash the party in ten minutes.• If no further contact by then, gatecrash the party.• Sometimes, a wild orang would appear out of the forest and gatecrash the party.• Anyone who tries to gatecrash will be turned away. 