100th birthday anniversary

a year

birth; nativity

celebrate

event (social event) / (computing) event (action which triggers an event handler) / (video games) a scripted event, a cut scene

hold an event

holding a conference or event

year-round

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend