There have been a variety of fan gatherings, you can usually find an older fan reminiscing about a convention, even if they might be vague on the year or location (Please contribute here!!)
Conventions in the 80'sEdit
Anecdotal stories have been told about West Coast gatherings, but more info is needed.
Modern Conventions (2013/2014)Edit
In March 2013, Jodi Lynn and Phyllis Friedman Paganucci organized the first Convention in years. Both Peter and Micky were there, in addition to Henry Diltz, Butch Patrick and many other celebrities.
In March 2014, they organized a gathering with Micky and Mike, LINK .