Do you have a thing. Most people have, and most adolescents do their own every so often. In the interest of variety, however, the lounges in the Freshman Union will be open Friday nights to help find someone else to do it for you.

From 8 to 11:30 p.m. on Friday starting today the third floor of the Union will be transformed into a happy hunting ground. With rock music blaring in the background so they can't and won't have to talk, Summer School and Harvard-Radcliffe students will mix, dance, and bump together in blissful bacchanalation.

With typical beneficence, the Summer School will provide records, cards, and chairs for what a source in the Social Director's office described as "dancing, listening, talking, and sitting." For more expensive activities, like drinking, cokes will be sold.

The source in the Director's office said yesterday that the "Do Your Thing" nights in the Union will provide a "mixer substitute" for those stranded, starved, and overheated in Cambridge this summer. Associate Social Director John Tolleson fathered the three Friday night galas in response to a spurt of requests for more mixers.

The Union's third floor contains a little-visited maze of small rooms and slightly larger lounges. Save your bodily fluids and visit the complex tonight. Emission is free.