Halloween falling on a Monday night means many adults are celebrating Saturday night, with many events scheduled around the city.

Ottawa dancers will join thousands around the world by performing Michael Jackson's "Thriller" dance at the National Art Gallery at 10:00 p.m.

"It's not hard but it's a sequence to remember," said Marcelle Charrois. "Now that I've done it for three years I really feel like Michael Jackson."

Ottawa Mayor Jim Watson started the day with his usual trips around to community events, but ended it at a decorated City Hall fulfilling his childhood dream.

"I always wanted to be a firefighter as a kid," said a costumed Watson, holding trick-or-treat at City Hall until 7:30 p.m.

For everyone who dresses up like a witch once a year (or twice when a new Harry Potter movie comes out), there's Ottawa's pagan community who live the life yearlong.

("Halloween) is a time when the veil between the worlds is at its thinnest," said Michelle Hrynyk, a pagan high priestess. "It's a time when the dead can easier come and visit us."

Ottawa's pagans are holding a charity ball at Maverick's on Rideau Street at 7:00 p.m. which includes a special wiccan ritual.

"People are invited to speak to the dead, pay a coin to the dead . . . the parting of the dead allowing them to come," Hrynyk said.

Some people are still looking for costumes to wear to these events.

"We're looking for a red and white shirt, glasses, the whole kit and caboodle," said one parent. "He wants to be Waldo this year."

"We're going as metal band zombies," said another group.

Costume stores CTV Ottawa stopped at assured us they had plenty of last-minute costumes available.

With a report from CTV Ottawa's Claudia Cautillo