Lots of people do it. You can always purchase lawn tickets at the gate. Seating in the pavilion is reserved for the big band and symphony concerts, so it's best to purchase pavilion tickets in advance. Yes, for groups of ten or more. Bus drivers and tour operators receive complimentary tickets.
Charter busses can easily drop off their group near the concert area, and parking is free.
The Festival is a wonderful event for the entire family. Children must remain with their parents and be supervised at all times. Pets are not allowed in the concert area. Patrons assisted by service dogs should check with gate personnel upon entering. Smoking is not allowed in the concert area.