July 30 - August 1, 2009
Mars Society Convention
University of Maryland
The latest research from Mars
Guests include many noted scientists

July 31 – August 1, 2009
Twicon
A convention devoted to Stephanie Meyer's Twilight series
Dallas, TX

July 31- August 1, 2009
Spocon
Spokane, WA
Science fiction and fantasy
Guest of Honor: L E Modesitt

August 1, 2009
Wasfen
Wausau, WI
Science fiction
Guests:Pat Rothfuss, John Jackson Miller, Kelly McCullough, Tim Seeley, Kathy Sullivan & Michael Hutchison

August 6-9, 2009
Starfleet International Convention
Geensboro, NC
Star Trek and space exploration
This year's theme is “One Small Step, One Giant Leap”

August 6-10, 2009
Anticipation
Montreal, Quebec, Canada
2009 World Science Fiction Convention
Guest of Honor: Neil Gaiman

August 7-9, 2009
Fandemonium
Nampa, ID
Science fiction, fantasy, gaming, animation, horror, comics-- this convention is for any aspect of fandom

August 13-16, 2009
Dum Dum
Dayton, IA
Edgar Rice Burroughs convention

August 14-16, 2009
Continuum
Melbourne, Australia
Science fiction and fantasy
Guest of Honor: Chelsea Quinn Yarbro, Narrelle M Harris

August 14-16, 2009
ArmadilloCon
Austin, TX
Science Fiction
Guest of Honor: Scott Lynch

August 21-23, 2009
Con-Version
Calgary, Alberta, Canada
Science fiction and fantasy
Guest of Honor: Terry Brooks, Tanya Huff, Robert J Sawyer

August 21-23, 2009
Wadfest
Nottinghamshire, England
Convention devoted to Terry Pratchett's Discworld series

August 21-23, 2009 Pi-Con
Pioneer Valley, MA
Science Fiction
Writer Guest of Honor: Mary Doria Russell

August 28-30, 2009
Bubonicon
Albuquerque, NM
New Mexico Science Fiction Convention
Guest of Honor: Michael Cassutt

August 28-20, 2009
Context
Columbus, OH
Speculative fiction and literature, writing seminars available
"A Friendly Gathering of Science Fiction Readers, Writers, and Publishers"

August 29-30, 2009
Mecon
Belfast, Ireland
Sponsored by Queen's University Belfast Science Fiction and Fantasy Society