I had a look last night, time based searches on Google and Twitter. The main thing that happened was Pharrell Williams announced a music festival in Virginia Beach, but it was just a press release and pre-made video.Very tenuous, but I wonder if there's a possible source of a bunch of mylar balloons on March 4, 2019, in Virgina Beach? I notice there's an expo called "The Outdoor Show" that seems like it might be on that date.
It was a Monday afternoon around 3pm, not a holiday - I guess a child's birthday party is a possibility but not one that would leave much of a digital footprint. Facebook would probably be the place to look.