The first ApacheCon, in 1998, was run as a way for the Apache Group to get together for the first time. Since then, it has had a similar purpose - to provide a place for the entire Apache community to assemble and form tighter community bonds. This is a complete list of ApacheCon or Apache:Core/BigData events; i.e. events for the entire ASF community.
1998 - San Francisco, CA - First ApacheCon, and first time the Apache Group assembled in one place; [http://www.apacheweek.com/features/apachecon98 reviewed]