Assembly/assemble
agenda
meek mere mellow
accrue
apostle
No, an anagram is a word game which is played by taking a word or a group of letters and making another word or words from those letters.
swivel
eventualism
ten years
Vandal
Glitterati
brood : a group of young animals or children
Another word for "convention," if you add three letters from "meet," is "committee." The word "committee" retains the idea of a group assembled for a specific purpose, similar to a convention.