Since Ryan Reynolds’ Deadpool & Wolverine is simultaneously a Deadpool sequel, the first Deadpool movie in the MCU, and the first R-rated MCU movie in general, it has a lot of box office draw. That draw only intensified when Hugh Jackman was revealed to be returning as Wolverine early on in the marketing campaign, eventually making his way onto the title card.
There’s also the fact that the movie looks like it’ll have massive implications for the storyline of the MCU going forward, so there’s probably going to be quite a few kids secretly catching the movie just to be caught up.