Events, sign-ups, attendance, rosters, loot and reports work for any game, with no module at all. A game module adds that game's own words, character details, event types and features. Switch modules on for your server in Guild Settings.
More games are on the way. Ask in the support server which ones, or request yours in the feature request forum.
Alagos works without a game module: events, sign-ups with role slots, confirmed attendance, rosters, loot and reports are all there from the start.