EASTER AT THE HARBOR:
Cool jazz will be featured at what the city administration is billing as the Inner Harbor Easter Family Celebration from 4 p.m. to 8 p.m. Sunday.
Free music will be played simultaneously on two stages, one near the Maryland Science Center, the other, at the Harborplace Amphitheatre.
At 4 p.m., Washington-based guitarist Jerry Gordon will lead his Quintet at the Amphitheatre. At the same time, trumpeter Vaughn Nark will play on the Science Center stage.
At 6 p.m., tenor saxophonist Ron Holloway will play at the Amphitheatre, while the Paul Carr Quintet, featuring Stephanie Jordan, will perform at the Science Center stage.
From noon to 4 p.m. Sunday, the Top at the Top of the World Observation Level of the World Trade Center, 401 E. Pratt St., will feature goodies for children, a magic show and a visit from the Easter Bunny. Admission. Information: 837-4636.
A GEM OF A SHOW:
Cher, Zsa Zsa Gabor, Victoria Principal, Joan Rivers, Liberace, Cary Grant and John Lennon have remote ties to the Inner Harbor area this weekend. Jewelry the celebrities once owned will be on sale or display at the 29th annual Original Classic International Gem and Jewelry Show at the Baltimore Convention Center from noon to 7 p.m. today, 10 a.m. to 7 p.m. tomorrow and 11 a.m. to 5 p.m. Sunday.
The show will feature displays of precious and semiprecious nTC gems, beads, crystals, fine and costume jewelry, and minerals collectibles. Admission. Information: (301) 294-1640.
SCIENCE OR FICTION?:
If you spot fanciful figures who look like they just stepped out of "Star Trek" or some other similar world around the Inner Harbor this weekend, chances are they're part of Baltimore Science Fiction Society's annual convention -- BALTICON 29. It opens today and runs through Sunday at the Radisson Lord Baltimore and Omni International hotels.
The convention will feature sci-fi author James P. Hogan, artist David Cherry, and artist and author Hal Clement. Also planned are the annual masquerade, an art show and auction, classic science fiction movies and a workshop for writers. Admission. Information: 997-0373.
SHOT TOWER CLOSED:
The Shot Tower, which you might call the city's best-known unusual landmark (a couple of blocks from the Inner Harbor) is closing to the public today and won't reopen until early June. Reason: installation of new exhibits, including a new sound-and-light show, all intended to better tell how gunshot was made throughout the 1800s in this 215-foot-tall brick tower at Front and Fayette streets