The Host
party animal
You could call them a party animal. The life and soul of the party opposed to a party pooper.
Party Pooper
You could call them a party animal. The life and soul of the party opposed to a party pooper.
Since you were at a party you know someone who knows her. So, call up the person who had the party and describe the girl. They may know who she is and if they do ask them if they will get a message to her or give her your phone number ( this way it is her choice to contact you or not). If she is interested she will call.
Host
Guest of honor
The host or hostess.
If it is the host that is leaving and the party is for them then yes, you do give a gift. If they are hosting the party for a friend or family member then you would give the gift to the person leaving.
If I understand your question a posed, the following answers apply: 1. The "calling party" is the person/phone who/which initiated the call. 2. The "called party" is the person/phone who/which answered the incoming call.
A gatecrasher barges in without an invitation.
A person who sets up an event is called a party planner