Check this site:
Lets-ride.com
They list 'runs' all over the world...
Another thing you can try is use your search and type in 'motorcycle events'. That should bring up a pretty extensive list of stuff to do on two wheels.
I have more access if anyone needs it. I have been Road Captian for a local; chapter of CMA for quite some time,a nd have filed up a bunch of sites.
Toy run - all the bikers bring a bunch of new toys to donate to santa's anonymous then ride all over the city in a planned route showing off their bikes, and the toys.
Of course I'm generalizing from a single example here, but everyone does that. At least I do.