See Science Fiction convention for a general overview.
“This page lists Science Fiction& Fantasy fandom events that have adopted a Conference...Conference anti-harassment/Adoption/SFF
“Penguicon is a convention of Science Fiction, Open Source Software, gaming, new media, and every...Penguicon
“Science Fiction conventions are a form of geek event at which Science Fiction fans gather to...Science Fiction convention
“WorldCon aka the World Science Fiction Convention is an annual Science Fiction convention most...WorldCon
“Readercon is a convention focused on fantasy, science fiction, horror, and more. From their...Readercon