How would I get celebrities involved?

[Gamble]

To Be Completely Honest thats Brilliant. Motorbikes Charity Run... Go to Tom Cruises facebook, Twitter, Myspace, Ect. Pages and Send Him a Message asking if Hes intresting tell him its With Motorbikes <--- he Loves Them, And Find a Good Cause.

Also Try Brad Pitt <---- Most People would think its unlikely but he is a Huge fan of motorbikes and he does go to alot of Charities He is invited to from random people.

Those are the only 2 people i can think of at the top of my head, but its worth a try. I Can Almost garentuee if you get ahold of One of the 2 guys there one will Join.