Grafton Towboat Festival on July 26 - 27 from 11:00am to 4:00pm CDT at Grafton Harbor, 215 W. Water St., Grafton, IL 62037. Experience "Life on the Mississippi River" at this annual festival in Grafton, Illinois. Take free tours of working towboats on the Mississippi River. Enjoy live music, special deals, giveaways and much more. For more information, call (618) 786-7678. Admission: $1/person.