A group of about 100 irate WDET listeners gathered Sunday at the Magic Stick nightclub in Detroit to plan strategy on how to get the station to return to a music format. They planned to file a class-action lawsuit against the station, which is owned by Wayne State University . They also discussed picketing at high-profile events such as the North American International Auto Show fundraising dinner and the NFL Super Bowl. According to its written statement, the grassroots group wants a compromise with WSU that would allow for some daytime music. The protesters say the news format is too similar to that at another public-radio station out of Ann Arbor . WDET, which had a $30,000 deficit at the end of its fiscal year in September, began airing more NPR news and talk programs last week.