|Official comings together of fans from various localities at a call issued by some organizations or local group. The largest are called conventions, smaller ones now called conferences.
A yet smaller and more informal getogether is the confabulation.
Oftentimes meetings of local organizations, like the QSFL or the LASFS, have had enuf attendees from outside to rate as conferences at least.
The most important thing about a fan gathering is that the slans can get together with their own kind of people, perhaps forgetting their introversion for a while, and do what they want to do and fangab about mutually interesting things, and develop their stefnic personalities.