No more worry about graduation seating. Enjoy a hassle free graduation day! Your family and extended family can enjoy guaranteed seating for 12 at this year's Linn-Mar graduation ceremony at Alliant Energy PowerHouse. If you don't need 12 seats, split this with another family for a great graduation experience! You cannot put a price on the comfort of knowing you have a spot for you and your family on the day you watch your child walk across that stage!