Jade Jagger and the Jagger Dagger.

Tonight, The Society of Memorial Sloan-Kettering Cancer Center celebrates its generous donors with a gala sponsored by MaxMara. The whole shebang benefits the Pediatric Family Housing Endowment, a new initiative that supports overnight stays for out-of-towners seeking care, and honors the generous Associates Committee ... Meanwhile, Fortuna Auction hosts a private preview party for its fall fine jewels auction. The setting’s perfect for excess—take that as you will—at furrier Helen Yarmak’s showroom on Fifth Avenue. Attendees will get a glimpse of Jade Jagger’s white-gold Jagger Dagger and a nearly 12-carat diamond; we’re not in the market, but it certainly doesn’t hurt to look.

Society of MSKCC Associates Committee Fall Party, The Four Seasons, 57 East 57th Street, cocktails at 7pm, dinner at 8pm, tickets and information can be obtained by calling (212) 639-2064; Fortuna Auction preview, 730 Fifth Avenue, invitation only.