Here's an updated list of local comic/science-fiction/anime/etc. conventions in the Colorado area in 2018! The update this time was small, but urgent!
NOTE: This does not include gaming conventions. I thought about adding them, but decided against it, just because I'm unlikely to ever go.
Denver Independent Comics & Arts Festival (DINK)April 14-15
StarFest
April 20-22
GainXP
April 27-29
Denver Comic Con
June 15-17
Denver Zine Fest
June 24
Myth and Legends Con 6/Westercon 71
July 4-8
Estes Park Comic Con
July 13-15
CO Springs Comic and Toy Con
July 28
Supernatural Offical Convention
August 17-19
Colorado Springs Comic Con
August 24-26
Fort Collins Comic Con
August 24-25
Nan Desu Kan 22
August 31-September 2
Pikes Peak Comic Convention
October 6
MileHighCon 50
October 19-21
DakuCon
November 9-11
Rocky Mountain Con
November 10-11
ChromicCon
November 10
Denver Retro Con
November 18
Also, here a con that is probably going to return this year, but has not announced a date...
Koelbel Con
to end with, here's a cosplay photo from Denver Comic Con 2017,

Tomorrow's wallpaper
Recent cover scans I added to GCD:
Disney Fairies vol 5 Tinker Bell and the Great Fairy Rescue
Disney Tangled the Series: The Friendship Mix-Up
Disney the Princess and the Frog Manga