May 3-5, 2013
Gaslight Gathering
San Diego, CA
Steampunk
Literature Guest of Honor: Jay :Lake

May 3-5, 2013
OutlandaCon
Atlanta, GA
GLBT science fiction, fantasy, horror and gaming convention

May 9-12, 2013
LepreCon
Tempe, AZ
Science Fiction and Fantasy
Author guest:Jack McDevitt

May 16-19, 2013
Nebula Award Weekend
San Jose, CA
Annual Nebula Awards from the SFWA
There is a huge list of author attendees

May 17-19, 2013
KeyCon
Winnipeg, Manitoba, Canada
Science fiction and fantasy
Author Guest of Honor: Ann Acquire

May 17-19, 2013
Mobicon
Mobile, AL
Science fiction, fantasy, comic, anime, and gaming

May 17-19, 2013
Scifi Valley Con
Altoona, PA
Science fiction

May 24-27, 2013
Balticon
Baltimore, MD
Sponsored by the Baltimore Science Fiction and Fantasy Society
Guests: Joe Haldeman, Rich Sternbach, Nnedi Okorafor, Ada Palmer

May 24-27, 2013
Baycon
San Jose, CA
Science Fiction and Fantasy
Author Guest of Honor: Lois McMaster Bujold

May 24-26, 2013
CONduit
Salt Lake City, UT
Science Fiction and Fantasy
Author Guest of Honor: Larry Correia

May 24-26, 2013
ConQuest
Kansas City, MO
Science Fiction
Guests: Patrick Rothfuss, Chris Garcia, Patricia C. Wrede, John Picacio, Teresa Nielsen Hayden

May 24-27, 2013
MisCon
Missoula, MT
Science Fiction
Author Guests: Jim and Shannon K Butcher

May 24-26, 2013
Oasis
Orlando, FL
Science Fiction
Writer Guest of Honor: Seanan McGuire

May 24-27, 2013
WisCon
Madison, WI
Feminist Science Fiction
Guests of Honor: Joan Slonczewski, Jo Walton