-athon

a suffix extracted from marathon, occurring as the final element in compounds which have the general sense “an event, as a sale or contest, drawn out to unusual length, often until a prearranged goal, as the contribution of a certain amount of money, is reached”: walkathon; readathon.

Words nearby -athon

-ass, -ast, -aster, -ata, -ate, -athon, -atic, -ation, -ative, -ator, -atory

Also -a-thon, -thon.