I like tailgate parties
Hi! So do i actually, there fun because they're a social event held around the open tailgate of a vehicle 
I loved going to them at football games.
I'm not surprised :) they originated in the US, they involve consuming alcohol and grilling food, perfect to have at a football game! 
Sometimes they get rowdy!
True, but i guess that's normal to have at a large social event. Also because many people attend Tailgate parties even if they don't have a vehicle with tailgates ! 
Yes, I do not own a tailgate haha
Me neither, but we're still tailgating! as that's what people are referred to who attend these partys  
the party never stops!
etc. which is sampled and shared among fans attending the tailgate. Tailgates are intended to be non-commercial events, so selling items to the fans is frowned upon.
Tailgate parties have spread to the pre-game festivities at sporting events besides American football, such as basketball, hockey, association football, and baseball, and also occur at non-sporting events such as weddings, barbecues, and concerts.
Food and drink.
Tailgating typically involves the consumption of alcoholic beverages or soft drinks and the grilling
Tailgate party
A tailgate party is a social event held on and around the open tailgate of a vehicle. Tailgating, which primarily takes place in the United States, often involves consuming alcoholic beverages and grilling food. Tailgate parties occur in the parking lots at stadiums and arenas, before and occasionally after games and concerts. People attending such a party are said to be 'tailgating'. Many people participate even if their vehicles do not have tailgates. Tailgate parties also involve people bringing their own alcoholic beverages, barbecues, food