Presentation on chastity and relationships, Dripping Springs Purified, an engaging presentation by author and speaker Jason Evert about chastity, love and relationships, will be presented Nov. 15 from 7 to 9 p.m. at St. Martin de Porres Parish in Dripping Springs. This event is open to students over age 13; parent attendance is encouraged. Tickets are $20 a person and can be purchased at www.stmartindp.org or at the door.