I'm know that the company that puts this event on is Xentel and have worked with them on a number of similar events with regards to CFL Alumni and the Local Fire Fighters/Police Officer Sofball game. They are a legit and reputable Charity Event organizer.
http://www.xentelevents.com/charities.html
I wouldn't expect the telemarketers to know much about the event its self as that's probly the script they were given to call about on that day. (?)