Event flags are spread over ConfigureDediServer(), ConfigureZoneInstance() and ConfigureQuestServer(). All are 0 (off) in the stock file. Set to 1 with a matching date cvar where one exists. 

-- ConfigureDediServer():
cvars.event_cosmonauticsDay = 0
cvars.event_gameAnniversary = 0
cvars.event_february23 = 0
cvars.event_march8 = 0
cvars.event_botPrefix = 0
cvars.event_claws = 0
cvars.event_knowledgeDay = 0
cvars.event_halloween = 0
cvars.event_invasionPVP = 0
cvars.event_valentinesDay = 0
-- ConfigureZoneInstance():
cvars.event_claws = 0                    -- April 1
cvars.event_invasionWithBeacons = 0
-- ConfigureQuestServer():
cvars.event_newYear = "2030-12-17T00:00:00Z"  -- future date = off
cvars.event_summer = 0
cvars.event_summerShip = 0
cvars.event_halloween = 0
For a party localhost, switch several to 1. New-year style events also need their date cvar moved near today.
Additional Notes: 

Also see universe_newYear and reward_eventGoldTimePeriod.

Comments

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