For many students Halloween was a day to dress up and have fun at school, but students at several schools across the Denver metro area were not allowed to wear their costumes.Several schools have banned Halloween costumes and events including Palmer Elementary School in Denver. That school instead held a Halloween carnival last Friday after school hours so it wouldn't interfere with the educational process.But not all Denver schools feel the same way about the holiday. Halloween can be completely different from school to school and district to district.In downtown Fort Collins, tiny angels, football players, and even little chickens filled the streets this Halloween. For them, it was a day of fun pretending to be someone or something else.At Red Hawk Ridge Elementary School in Aurora, it was the complete opposite because costumes could not be found after the school decided they wouldn't be allowed."It doesn't bother me because I think it's just a distraction if they're worried about what costume to wear," said parent Rae Araoua.Most school districts across the metro area leave the Halloween decision up to each individual school.Some like Red Hawk decided they didn't want any part of it, while others allow costumes and parades with certain restrictions."The schools that do have a costume parade don't allow masks or fake blood or anything that might be little scarier," said Tustin Amole of Cherry Creek Schools.At many high schools in Douglas County, such as Thunderridge, masks or makeup that hides a person's identity are not allowed for safety reasons."He's in first grade and we're trying to set the example now that when you are in the classroom you focus on the classroom and fun is for later," said Araoua.Many school districts said even if they allow costumes, students must conform to the district dress code.A number of schools across the country have banned Halloween activities because many parents consider the holiday to have pagan or satanic overtones.However, the schools 7NEWS spoke with Tuesday said religion did not play a role in their decision.