Cheyenne Comic Con
May 12-14
Definitely
Once Upon a Time Official Convention
June 2-4
Maybe?
Denver Zine Fest
June 17
Maybe?
Denver Comic Con
June 30-July 2
Definitely
Myths and Legends Con
August 4-6
Maybe?
Colorado Springs Comic Con
August 25-27
Not Attending
Fort Collins Comic Con
August 26-27
Not Attending
Nan Desu Kan
September 1-3
Probably
Tacticon
September 28-October 1
Not Attending
Rocky Mountain Con
September 30-October 2
Probably
MileHiCon 49
October 27-29
Maybe?
DakuCon
November 10-12
Maybe?
Chromic Con
November 18
Not Attending
Also, here are cons that are probably going to return this year, but have not announced their dates...
CLASSICon
Colorado Cosmic Comic Con
Denver Retro Con
Running of the Leaves
In conclusion, Audrey II and Seymour cosplay from Starfest 2017!

Tomorrow's wallpaper
Recent cover scans I added to GCD:
Donald and Mickey: The Persistence of Mickey
Donald Duck #19/386
Donald Duck #19/386 subscription cover
Mickey Mouse #19/328
Mickey Mouse #19/328 subscription cover
Mickey Mouse #19/328 retailer incentive cover
Uncle Scrooge #25/429
Uncle Scrooge #25/429 subscription cover
Uncle Scrooge #25/429 retailer incentive cover