crash the gate - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Gain admittance, as to a party or concert, without being invited or without paying. For example, The concert was outdoors, but heavy security prevented anyone from crashing the gate. This term originally applied to persons getting through the gate at sports events without buying tickets. By the 1920s it was extended to being an uninvited guest at other gatherings and had given rise to the noun gatecrasher for one who did so. [Early 1900s]