A shindig is slang for a party.
A multi shindig means more than 1 guest.
Some hotels charge joiner fees for more than 1 guest. (Top tip, whenever you book a hotel room always book for 2 people, so that covers the first 'guest').
So if you rent a condo this wouldn't be an issue, but if you wanted to take 3 LBs back to your hotel, then you may get charged for 2 additional joiners.
SAG