Until about two hours ago, if you Googled “Avengers 4 release date” you’d have gotten a little window that said “MAY 3, 2019.”
Technically if you Google it right now, you get the same info.
That movie was originally scheduled for the first weekend in May, and then shortly before the release, they announced it would instead debut the last weekend of April.
It seemed to work out okay, since the movie wound up grossing over $2 billion worldwide.