The Crimson Key Society's second annual All-College Weekend gets underway tonight with two House dances, a movie, and a play. More than 650 tickets have been sold for tomorrow night's formal 'April in Paris," R. Peter Rose '51, chairman of the dance committee announced yesterday. Last year's ticket sales reached 800.

An all-college informal dance will be held at Kirkland tonight, and will feature entertainment by the Krokodiloes. Dunster is holding a masquerade ball, but the affair is open only to House members.

Ivy Films' showing of "Ecstasy" tonight was arranged for the Key weekend. The Harvard Theater Group's "Darkness at Noon" is the featured play.