[rlowe61]

This can be a sticky situation, which can be handled many different ways. Depending on distance to events, I have participated in carpooling, School Bus, Charter Bus and Planes. For the carpooling ensure your team draws up a permission slip so that the parents/mentors driving feel comfortable taking other students. For the Charter bus and plane, it is more the cost issue.
As for trailer, many teams have trailers and a mentor or two take the trailer while the students and other mentors take buses, planes etc. The School bus is always practicle for local events. I will say, though the charter bus for 10-16 hrs can drain you, it is also quite fun and a great team builder, as the kids really get to know each other during that time.
On a different bit of the topic of students to events, as you grow your team will want to come up with requirements for attending. I know CRyptonite has a minimum of build hrs and non-build hours students must have to travel to events. They do allow all students to attend the Lonestar Regional since it's just downtown and we car pool. But something to think about in the future as you grow.
Good Luck