Northborough – Certified Zumba instructor Diana Rolashevich will lead an interval-style, calorie-burning dance fitness party in the cafeteria at Marguerite E. Peaslee School, 31 Maple St., Saturday, Jan. 31, at 10 a.m. This one-hour class will raise funds for Peaslee PTO enrichment programs. All levels welcome. The cost is $10 per person (adults only).