Many convention-goers wear elaborate costumes or cosplay that take a lot of work and skill to craft, while others get a little more use out of last year's Halloween costume.
Either way, everyone has a lot of fun.
During day two of ComicPalooza, fans lined up early to meet Spider-Man himself, Tom Holland.
The Avengers star signed autographs and took pictures with fans. He also took part in a Q & A session.
Convention-goers showed no shortage of spirit, donning elaborate costumes. A lot of families and groups even coordinated their costumes.
Founder John Simons said this year is especially special because ComicPalooza is celebrating its tenth anniversary.