the.com/fest

means A suffix (or standalone word) marking an event as a concentrated binge of whatever comes before it — more of that thing, gathered into one occasion.

from From German Fest, meaning 'festival' or 'celebration,' which traces back to Latin festum (a feast day), kin to festivus — the root that also gives English 'festive' and 'feast.' English borrowed 'fest' as a standalone word and productive suffix, stacking it onto nouns (songfest, gabfest, slugfest) to mean a gathering devoted entirely to that activity — a habit that picked up steam in American English, especially in journalism and casual coinages.