Iowa City-based education startup ClusterFlunk's founders will speak at the Aug. 20 Business Innovation Zone luncheon. AJ Nelson and Joe Dallago will talk about lessons they've learned while building a social networking site aimed at helping college students connect with each other and share notes or study together. The $15 lunch will be 11:30 a.m. to 1 p.m. at StartupCity Des Moines, 317 Sixth Ave. Registration can be done here.