Merrymaking 

Just like it's used to describe common celebrations like Christmas and Easter, it refers to a party involving people coming together to have a good time and participating in the events and activities, usually invloving in music, sex, drugs and alcohol, that are taking place at a persons home.

Apparantely everyone is merrymaking up at some hussey's house tonight over in Alfredon, be there or be square.

Merrymaking by benjiUØCH September 1, 2007

Mentor of Merrymaking 

(Noun) An educator of gifted individuals that specializes in teaching the fine art of merriment, drinking and all things jolly.

Jacqueline is the first “mentor of merrymaking” to participate in the 40 year old gifted parents spring winery tour and deck party.

Mentor of Merrymaking by kerb-stirer September 20, 2014

merrymating 

A sexual encounter that takes place during a night of carousing, or otherwise drunken revelry.
Orgies not mutually exclusive.

Marmaduke: 'You are cordially invited to attend an evening of Bach, cribbage, and orgiastic festivity, on the 14th day of May. Arrive at 4:45 in the post meridian, and carriages for no later than dawn.'

Fitzwilliam: 'No doubt another one of your choir, cards and chains evenings?'

Marmaduke: 'Yes, the usual merrymating.'

merrymating by Toby Hine March 28, 2007