Celebrating a quartet of years as one of the Quad Cities' most popular FM radio stations with a free fiesta at East Moline venue the Rust Belt, I-Rock 93.5 will present the Four Freaking Years of Hard Rock: The I-Rock Anniversary Party on September 15, the night appropriately featuring four sets by gifted rock ensembles: Alborn, Through Fire, Iowa City's NonGrata, and the chart-topping Nonpoint.