WARWICK-The Warwick Valley Humane Society will celebrate its 50th Anniversary at a fundraising brunch to be held on Sunday, Oct. 24, beginning at noon at the Landmark Inn on Route 17A in Warwick. Invitations are extended to all friends and supporters of the humane society, said Suzyn Barron, president of the Humane Society. Cost is $25 per person with reservations required by Oct. 15. Send a check or money order payable to Warwick Valley Humane Society,P.O. Box 61, Warwick, NY 10990. For more information, call 986-2473.