For opera lovers, An Evening with Renée Fleming is a once-in-a-lifetime event. (It comes with a once-in-a-lifetime price tag, but well get to that in a minute.) Perhaps the most captivating singer since Maria Callas, the Grammy Award-winning Flemings intimate performance, a fund-raiser for Rice Universitys School of Opera, includes solo recital selections and a short program of works accompanied by the schools orchestra. Its an operaphiles dream. Theres just one little catch: Tickets start at $1,000. 7 p.m. Stude Concert Hall, Rice University, 6100 Main. For information, call 713-348-3492 or visit www.music.rice.edu. $1,000 and up.