There are several conferences, in North America and Europe, where you can meet with members of the DITA community.
Bright Path Solutions conferences include
Center for Information Development Management conferences include
DocTrain also offers industry-specific conferences, including DocTrain Life Sciences, which includes several DITA-focused sessions, including sessions exploring the use of DITA for enterprise business documents._______________________________
The Gilbane Conferences on Content Management Technology meet in Boston, San Francisco, and Washington each year with many sessions on DITA._______________________________
STC has an Annual Conference with many sessions on DITA.
WritersUA has an Annual Conference with many sessions on DITA.