From congregate + -or. congregator (plural congregators) A person who congregates or assembles congregātor second/third-person singular future passive...
gregarious. (UK) IPA(key): /ˈkɒŋ.ɡɹə.ɡeɪt/ congregate (comparative more congregate, superlative most congregate) (rare) Collective; assembled; compact. 1605...
From congregate + -ive. congregative (comparative more congregative, superlative most congregative) That congregates congregativeness congregātīve vocative...
From congregative + -ness. congregativeness (uncountable) The quality of being congregative....
congregable (not comparable) Able to be brought together. 1851, The Christian Remembrancer, volume 21, page 162: […] an affair combining more features...
əˈsɛmbli/ freedom of assembly (uncountable) The right of citizens to freely congregate or assemble anywhere should they wish to. freedom of association freedom...