The North often boasts of its parades but reports of this surfaced afterwards with TV only airing delayed footage.
This event is usually held in April and moving it had been seen as a setback to the warming of ties over the Olympics.
But the South announced on Thursday its president would meet the North's Olympics delegation on Saturday.
Moon Jae-in will have lunch with the 22-strong team, which will include the North's ceremonial head of state, Kim Yong-nam, and Kim Yo-jong, the influential sister of Kim Jong-un who will become the first member of the ruling dynasty to visit the South. Both were at the parade.
What do we know about the parade?
Early on Thursday state TV began showing patriotic films in what appeared to be a prelude to a live broadcast.
But delayed and unscheduled footage of the event only appeared on TV in the North at 17:30 local time (08:30 GMT).
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