Dr. Bruce Rittmann will present “Risk and Opportunity in Climate Change” from noon to 1:30 p.m. Friday, April 20, in the Missouri-Ozark Room of the Havener Center. Tickets are $20. Menu choices are seafood pasta or chicken cordon bleu. RSVP to Marsha Grayer by Monday, April 2. Rittmann will present the Stueck Lecture later that afternoon.