祭り【まつり】
festival, feast, harassment by an Internet pitchfork mob, online shaming, flaming, galore (as in "goals galore"), frenzy, mania
慰霊祭【いれいさい】
memorial service
冠婚葬祭【かんこんそうさい】
important ceremonial occasions in family relationships
祭壇【さいだん】
altar
祭礼【さいれい】
(religious) festival
後の祭り【あとのまつり】
a day after the fair, (at a) stage when it's too late
祭る【まつる】
to deify, to enshrine, to pray, to worship