[2][3] Activities at a NASFiC are similar to those at a Worldcon, but may differ somewhat with each convention committee.
It generally occurs near the time of the Worldcon, but not in direct competition with it.
Fifteen NASFiCs have occurred to date with the sixteenth scheduled for July 2024.
The name NASFiC is owned by the World Science Fiction Society (WSFS).
The late Robert Sacks organized an attempt to separate NASFiC from the World Science Fiction Society, similar to Eurocon, but WSFS has chosen to keep control of NASFiC.