...Tomorrow night, New York's new-jazz firepower will be concentrated near Seventh Avenue South and Bleecker Street. First, the one-time-only all-star gathering at Jazztrack, 27 Greenwich Street (645-2387), where a quintet led by Andrew Cyrille on drums and Julius Hemphill on saxophone, with Fred Hopkins on bass, Henry Threadgill on saxophone and Tony Underwood on tuba, performs at 8 and 10 P.M.; tickets, $12. Then we'd cross the avenue to Sweet Basil (88 Seventh Avenue South, above Bleecker, 242-1785), where the tenor saxophonist David Murray is leading his octet through some of the most tuneful, punchy new jazz now being written; sets at 10 and 11:45 P.M. and 1:30 A.M.; $12 cover, $6 minimum.
And on Sunday, to a former church: a benefit from 10 P.M. to midnight for Amnesty International, the human-rights group, at Limelight, the church-turned-discotheque at 660 Avenue of the Americas, at 20th Street (807-8400). Tirez Tirez, the minimalist-rock band, will perform, with appearances by Lou Reed, Margot Kidder, Ruben Blades and others. Donation: $10.