surprise-partie

Etymology
From ; sociological note: parties were social events where invitations were sent out to the invitees, be they children or teenagers. The novelty of the surprise-partie was its informal organization. When this became the norm, the word was re-analyzed to mean "a party thrown to surprise the one in whose honor it is made", and, in its original sense, shortened as, ,.

Noun

 * 1) party
 * 2) surprise party
 * 1) surprise party