James Lileks pointed me to this blast from the past with some unfortunate modern twists.
On-site security had quashed a brawl at a Coon Rapids skate party Sunday night when five backup officers and a dog arrived, sending 1,200 partygoers into panic mode.....The teenagers and young adults attending the party sponsored by Shine On Entertainment were sent home about 9:20 p.m. after several fights broke out at the rink at 3075 NW. Coon Rapids Blvd.
I hadn't thought about rollerskating rinks in a long time. This page says there are only two in South Dakota, in Sioux Falls and Rapid City of course. I guess it's good that the rink in the story seems to do good business, at least based on the fact that there were that many people there. The number of fights does seem to indicate a problem,though.