MARQUETTE — Members of the Theta Alpha chapter of the Phi Sigma Sigma sorority are asking for community support as they participate in the group’s 16th annual Rock-A-Thon to benefit the National Kidney Foundation. The Northern Michigan University sorority is hoping to raise $1,000, said fundraising and philanthropy chairwoman Amanda Barnum. “It’s pretty much been our goal since we started,” she said. The Rock-A-Thon is a fundraiser for NKF done across the country by Phi Sigma Sigma chapters, she said. “Everybody does some version of it,” she said. “Some people do it with bands, some people do it with rocking chairs, but we all have our own twist on it.” Locally, they will be rocking in rocking chairs throughout the entire TV6 Craft Show at the Superior Dome, which runs Dec. 4 through 6. About 22 Phi Sigma Sigma members will take turns rocking in five rocking chairs for 20 hours over the three-day event. “We like to do it every year,” Barnum said. “It’s a fun thing.