A gathering of peoples revolving around a similar interest, idea, or hobby.
Did you go to that business convention? Yes, they were discussing the future of intel-based chipsets.
A crackin' ass party with a lot of people in attendance.
Bigger than a function.
Person 1: "Hella people were at that party last night, it was a zoo"
Person 2: "That party was crazy, it was a straight convention"