Niagara Falls Runs Dry Day is observed annually on March 29 to commemorate the rare event in which Niagara Falls temporarily ran dry due to ice blockages. This phenomenon occurred when strong winds pushed ice from Lake Erie to the mouth of the falls, halting the water flow for over 30 hours. The holiday celebrates this extraordinary occurrence, which spans from Ontario, Canada, to New York, United States. Typical festivities include offers from local establishments and celebration parties near the falls. The event is marked by the unusual silence that replaced the usual roar of the waterfall, drawing crowds who ventured across the riverbed to witness the phenomenon. Niagara Falls has never naturally dried up since this incident.