Son RHP attended PBR Futures a few years ago. It was extremely well run with the top colleges present and fully engaged. Glad we went for the experience, outside of the 13 hour drive each way.
The reality was, however, it didn't do much for my son's recruitment. He only topped at 83 MPH at the event, as he was a late bloomer. There were kids throwing 90, they're the ones who got offers. Plus, my son only wanted to play in the northeast. While some NE schools were there, we didn't need to go to Indy to be seen by them. We did it mainly for the experience for him to build from.
My son is a 2019 and went in 2017. If my math adds you, your son is 1 year lower grade-wise. So, his measurables are better than my son, so he may project better.
Go if you want a great experience, or think you can get onto some school's radars. If you're going in hopes of an offer, make sure he's top of the class at that point. There are parents on this board who's kids were offered as a direct result of PBR Futures, so there is a chance.
Good luck!