Critic Jeremy Eichler recommends 10 upcoming performances in the Boston area, including a number of celebrations of the 100th anniversary of John Cage’s birth: New England Conservatory (Feb. 6 is the first of many); Longy School of Music (Feb. 9, with So Percussion); MIT (Feb. 13, with pianist Vicky Chow); and at the Gardner Museum (March 1, with the Callithumpian Consort).