It is a Harley rally but I doubt you have to ride a Harley there.
Some good news for riders in NH:
HB 148, relative to federal funding for motorcycle-only roadside checkpoints, is a pro-motorcycle, anti-federal money bill that was signed by Gov. Lynch on May 16th and became law with overwhelming bi-partisan support.
http://www.gencourt.state.nh.us/legislation/2011/HB0148.html"124:15-a Motorcycle-Only Roadside Checkpoints. No law enforcement agency of the state or a political subdivision of the state may accept federal funding the purpose of which is to establish motorcycle-only roadside checkpoints."
Apparently, there is a special federal government fund for this and at least GA has already taken advantage of the money.
NY has been conducting motorcycle-only roadside checkpoints for some time, even without federal money and a related case is in the federal court system.