assemble
The right to assemble.
Assemble means to make something. It can also mean to gather a large group of people. Synonyms would be to gather, to collect, to congregate or to convene.
gather, assemble, meet
gather, assemble, meet
The verb to assemble (come together) has the synonyms congregate, gather, or join. The transitive verb to assemble (something) is to compile, organize, construct, amass, or accumulate.
gather, assemble, accumulate, round up, collect
The freedom to assemble
gather, save, assemble, heap, accumulate, amass, stockpile, hoard
harvest
The opposite could be gather, assemble, or congregate. (Disperse can be either transitive or intransitive.)
The right to assemble is simply the right to gather in a group and the right to petition is the right to actually file a motion to be heard in front of the appropriate court.