WordNet sense 1 (sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching):

gathering

WordNet sense 2 (get people together):

assemble

WordNet sense 3 (collect in one place):

forgather, meet, foregather

WordNet sense 4 (assemble or get together):

collect, garner, collect, pull together

WordNet sense 5 (draw fabric together and sew it tightly):

pucker, tuck

WordNet sense 6 (collect or gather):

accumulate, amass, conglomerate, cumulate, conglomerate, pile up