Registration for intersession 2026 Si Beagle classes begins on Oct. 14 and ends on Nov. 14. Intersession 2026 is a five-week program of classes that begins on Jan. 6, 2026, and ends on Feb. 5, 2026. You can register online or mail in your registration, along with a check, to UFTWF Retiree Programs, 52 Broadway, 17th floor, New York, NY 10004.