August 2-4, 2013
Diversicon
St. Paul, MN
Speculative Fiction
Guest of Honor: Jack McDevitt

August 2-4, 2013
Harbour Con-Fusion
St. John, New Brunswick, Canada
Multi genre

August 8-11, 2013
Dum Dum
Dayton, IA
Edgar Rice Burroughs convention

August 9-11, 2013
Spocon
Spokane, WA
Science fiction and fantasy
Guest of Honor: Brandon Sanderson

August 9-11, 2013
Wadfest
Nottinghamshire, England
Convention devoted to Terry Pratchett's Discworld series

August 9-11, 2013
When Words Collide
Calgary, Alberta, Canada
Muti genre faestival for readers and writers
Fantasy and Urban Fantasy Author Guest: Patricia Briggs

August 11-14, 2011
The Official Star Trek Convention
Las Vegas, NV
Star Trek

August 15-18, 2013
Gen Con
Indianapolis, IN
Gaming Convention

August 23-25, 2013
Bubonicon
Albuquerque, NM
New Mexico Science Fiction Convention
Guests of Honor: Tim Powers and Brent Weeks

August 23-25, 2013
Necromonicon
Providence, RI
Lovecraftian convention
Special Author Guests: Laird Barron and Caitlin R. Kiernan

August 27-29, 2013
Context
Worthington, OH
Speculative fiction and literature, writing seminars available
"A Friendly Gathering of Science Fiction Readers, Writers, and Publishers"
Science Fiction Guest of Honor: Jack McDevitt
Fantasy Guest of Honor: Elizabeth Bear

August 29- September 2, 2013
LoneStarCon
San Antonio, TX
The 71st World Science Fiction Convention
Special Guest: Joe R. Lansdale
Other Guests: Ellen Datlow, James Gunn, Willie Siros, and Norman Spinrad