roundup

abbreviation, abridgment (or abridgement), compend, compendium, condensation, curtailment, shortening

simplification, streamlining

rehash, reprise

conclusion, epilogue (also epilog)

ball, batch, bunch, cluster, huddle

heap, pile, stack

band, brigade, muster, raise, rally

flock, herd, hive, pack, press, swarm, throng

combine, connect, join, link, merge, pool, unite

arrange, collate, compile, organize, systematize

scrape (up or together)