My annual bit of advice for parents traveling to graduation and/or Parents Weekend. Rental car rates from Denver Int'l Airport are exorbitant if you book early (like 6-4 months ahead.) Prices drop as you get closer to the event. I've been watching rental cars for May's graduation. As of last month, a full size car from DEN from May 23-29 was over $500. Today, Alamo is $254. Enterprise is $270. The same thing happens before Parents Weekend....prices drop around end of July and early August. Happy travels!