congregating

balling, batching, bunching, clustering, huddling

heaping, piling, stacking

banding, brigading, mustering, raising, rallying

flocking, herding, hiving, packing, pressing, swarming, thronging

combining, connecting, joining, linking, merging, pooling, uniting

archiving, arranging, collating, compiling, organizing, systematizing

scraping (up or together)

re-collecting, regathering, regrouping

affiliating, allying, associating, banding (together), caucusing, clubbing, collaborating, confederating, conjoining, consolidating, consorting, cooperating, coupling, federating, ganging up, joining, merging, uniting

reassembling, reconvening, regathering, remeeting