From The Collaborative International Dictionary of English v.0.48 [gcide]:
gatecrasher \gate"crash'er\ verb (used with an object) A person who enters into a party or other social event without an invitation, or into a theater or other public performance without a ticket. [PJC]
From WordNet (r) 3.0 (2006) [wn]:
Define.com is a PRIVATE SECTOR NONPROFIT EDUCATIONAL WEBSITE that PROMOTES WORLDWIDE ELECTRONIC DEMOCRACY, OPEN and TRANSPARENT GOVERNMENT and WORLDWIDE BANKING REFORM.
Eye and Pyramid BANKING REFORM CHALLENGE