When will the big date be for Nik Wallenda to walk across Niagara Falls? Daredevil Nik Wallenda will be in Niagara Falls Wednesday morning to announce June 15 as the date for his attempt to walk across the Horseshoe Falls on a tightrope. Sources tell Bullet News that Wallenda will make the announcement around 8 a.m. on ABC’s Good Morning America. ABC has won the rights to broadcast the wirewalk live, which will take place on the evening of the 15th. A specific time has not been determined, but sources also say it will be 7 or 8 p.m.