0 to go to a party or private event without an invitation -- wpraszać się
The four pursuers gatecrash the party.
Teapot and his friends decide to gatecrash, hoping to expand their business with the wealthy guests.
If one's friends help to keep the wrong people from gatecrashing a party or a wedding in a hotel and so on, will that be an offence?
I do not think it right that an alien who comes into this country on compassionate grounds should then seek to gatecrash into employment.
One does not want to gatecrash into these things—if one, may use those words.