This postcard of the Mississippi Melodie Showboat at Grand Rapids, Minnesota has a July 1964 postmark. This year is the 57th year for the Mississippi Melodie Showboat. The 2012 dates are July 12 - Jul 14, July 19 - July 21, and July 26 - July 28 (the last three weekends in July).
The showboat is on the Mississippi River. The performance takes place on the showboat landing while the audience sits in stadium seating on the banks of the river.