[Cothron Theiss]

Hi! I'm not from Minnesota, but I'm pretty familiar with the issues you're describing so I'll pitch in. Unfortunately, I can't help much since your school's rules are actually pretty reasonable. So you'll need to talk to your school and figure out what you guys need to do to comply with the rules and try and reach some compromise on the issues that your school may not fully understand.

As for issue #1, talk to your school about just how inclusive you have to be. Ask if you're allowed to set requirements beforehand on what qualifies members to go to off-campus events, such as an hours requirement, or a leadership position requirement, or some other guidelines that you can set in place permanently that you and your school can agree upon. If They will not agree to this, compare robotics to the sports. Not every member of the football team is on Varsity. Not every member of the robotics team is critical at events.
(That being said, I think you should always strive to let every member who puts his/her time in go to events, but I understand that's not always possible.)

Regarding issue #2, you don't have as many options. That rule is most likely related to the school's insurance, and for some reason, administrators are kinda touchy about that stuff. First, clarify whether or not parents are allowed to drive their children and only their children to and from events. Since there's almost no way that will cover everyone, see if you can find ways to offset the cost of the bus. These days, most schools wouldn't let you do this, but see if there are any odd jobs or broken appliances or work that your team can take care of for a reduced bus price. Also, see if your school would allow one of your mentors or parents to become a registered bus driver. This process can be wildly different form state to state, but my high school's marching band gets parents to become registered bus drivers so we don't have to pay for drivers. That drops the cost of buses pretty significantly.