NEW YORK -- For 30 years, Tony Hawk has been skateboarding and spreading the word about his sport.

"I still can't believe I get to do this at my age," said the 44-year-old Hawk, who got into the sport as a child because of his hyperactivity. "Every day is a new surprise for me."

Today, Hawk, along with more than 100 other celebrities, will take part in Charity Day, the annual fundraiser in commemoration of the 658 Cantor Fitzgerald employees lost in the World Trade Center attacks on Sept. 11, 2001. Cantor Fitzgerald and BGC Partners donate 100 percent of their global revenues from the day to more than 100 charities, which includes the Tony Hawk Foundation.

"It's a day to remember and honor the victims of 9/11, and I'm so glad they put on this program to help all these charities in need," said Hawk, whose foundation has built more than 400 skate parks in low-income areas around the United States. "I'm so honored they chose our foundation as one of the recipients."

Hawk made the most of his trip to New York by meeting his fans Monday night at a special Town Hall for SiriusXM to talk about the sport and his foundation.

Hawk sat down for an exclusive Q&A with the audience of SiriusXM listeners at the midtown studios. The special was hosted by skateboarder and director Stacy Peralta, who directed the film "Bones Brigade: An Autobiography," which is set to be released in November.

"I was honored that there were enough fans interested in asking questions," said Hawk, who hosts Demolition Radio, a weekly show on the SiriusXM Faction channel. "Skateboarding has gotten bigger than anybody could imagine."