I have attended some of these in the past. Click on the links to get to 2019 events.
Maryland Writers Association Conference; March 29-31 – BWI Airport Marriott
Historical Novel Society -North America; June 19-21 — Oxen Hill, Maryland
Writers Digest Conference; August 23-25 — New York City
Creatures, Crimes, and Creativity (3-C) Con; September 13-15 (events all day, each day) — Sheraton Columbia Town Center, Columbia, Maryland
Creative Non Fiction Conference; date TBD
The Writers Center, Bethesda; On-going events