Sometimes these are a subset of road trips, but you might be astonished what demonstration opportunities exist in your own town.  You might even be able to get nearby freethinkers from other campuses to join you.  A salient example is the Godless Americans March on Lansing.  The Michigan State Freethinkers Alliance was only a short drive from this event, but Students For Freethought at OSU drove for five hours to attend this event.  Much to the delight of the Michigan State Atheist organizers, both groups had speakers at the event.

 
MSUFAers at the Godless Americans March on Lansing