Grammy Award-nominated pianist, composer and bandleader Fred Hersch returns to Wilton Library for another performance in the Brubeck Room.    Reception following the concert. CDs available for purchase and signing. Suggested donation: $10. Funded by William and Karen Tell Foundation with special thanks to Ed and Catherine Romer and Chris & Tish Brubeck. Advance registration strongly suggested. Pre-registrants should arrive by 7:20 p.m. to be guaranteed seating; wait-listed and walk-in registrants will be admitted after 7:20 p.m. if space is available.