New Canaan High School senior Olivia Park takes Spanish, not Latin, so she’s never had a class with David Harvey. And before last week, she never had reason to meet the (white-haired) teacher. Then a sophomore, Austin Pelli, a student of Harvey’s and member of the extracurricular club that Park founded two years ago—the Rising to a Cure Club—hit on an idea for a fundraising challenge: They’d try to raise $200 in spare change collected from students during two lunch periods, and if they reached that goal, Mr. Harvey would dye his hair pink. “I think they sold me cheap, frankly,” Harvey said with a smile Wednesday afternoon in Room 114, Park sitting one desk away. In all, the club raised $279.66, and Harvey on Thursday evening will dye his hair pink as promised (with a hand from his son’s girlfriend—his boys are unwilling to help) then come to school Friday and face the student body.