Vietnam reopened recently and many of my friends were quick to book their plane ticket to Vietnam or for the Summer. It's like no one told them it's rainy season. I can't talk them out of it because they already booked their ticket.
Just looking at Saigon's weather this week, it's raining 6 days out of the week. My guess is that they couldn't wait any longer. I'll plan my trip after the rainy season but I really hope Vietnam doesn't close down again.