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Oh boy I've been trying to look for this up for you because I know I've seen this way back like maybe two or three years ago, I'll see if it's deep in my archive on Tumblr somewhere if no one else jumps in on the scene first.
Here we are.
The link leads to the first page by Patronustrip on Deviantart.
http://patronustrip.deviantart.com/art/CnH-Tribute-ONE-163525977
Okay, so, what I'm looking for is a lengthy-ish Calvin and Hobbes fancomic. It involves a mid-to-late teenage Calvin taking Susie to a Halloween school dance, and after running into some trouble with some bullies at the dance, Calvin and Susie decide to go trick-or-treating instead (something either Calvin or Hobbes had proposed doing instead of the dance). I also remember that it was a black and white comic.