WordNet (r) 3.0 (2006):

come about
    v 1: come to pass; "What is happening?"; "The meeting took place
         off without an incidence"; "Nothing occurred that seemed
         important" [syn: happen, hap, go on, pass off,
         occur, pass, fall out, come about, take place]

Moby Thesaurus II by Grady Ward, 1.0:

136 Moby Thesaurus words for "come about":
   about ship, alter, ameliorate, attain fulfillment, attend,
   back and fill, be changed, be converted into, be found,
   be met with, be realized, be renewed, bear away, bear off,
   bear to starboard, beat, beat about, become of, befall, betide,
   bottom out, box off, break, bring about, bring round, cant,
   cant round, cast, cast about, change, change course,
   change the heading, checker, chop, chop and change, come,
   come around, come down, come of, come off, come out, come round,
   come to pass, come true, degenerate, deteriorate, develop, deviate,
   diverge, diversify, double a point, end, ensue, eventuate, fall,
   fall out, fare, fetch about, flop, follow, gain strength, go about,
   go off, gybe, hap, happen, haul around, heave round, heel, improve,
   issue, jibe, jibe all standing, meliorate, miss stays, mitigate,
   modulate, mutate, occur, pan out, pass, pass off, pivot,
   pivot about, ply, prove, prove to be, put about, put back, rally,
   recover, recuperate, result, revive, round, round a point, sheer,
   shift, slew, spin, swerve, swing, swing round, swing the stern,
   swivel, tack, take a turn, take place, terminate, throw about,
   transpire, turn, turn about, turn around, turn aside, turn back,
   turn into, turn out, turn round, turn tail, turn the corner,
   undergo a change, unfold, vary, veer, veer around, warp, wear,
   wear ship, wheel, wheel about, whirl, wind, work out, worsen,
   yaw