Welcome. Plenty of good information on here. Easy search capabilities. Lots of good advice and insight from a lot of angles.
PG grade means absolutely nothing to college coaches or scouts. PG Showcases are just a money grab for PG. $700 and they do the same at every one so don't feel you have to travel to special ones or areas, unless you're trying to get in front of coaches/scouts in those areas (if allowed, check the NCAA Recruiting schedule). The only benefits to a showcase is to go to a region where you think a coach or scout may be; getting used to being gunned and watched and cattle called. My son, 2021 RHP GT commit, is in the hunt for reps. We're trying to keep him active and throwing due to an extremely anemic innings pitched year as we continue to ramp for PG WWBA in Jupiter ("THE EVENT" to go to for exposure. Get on a team and go to that!) There was an event during a lull in game schedule and availability so we took it and he attended the PG South Top Prospects Games at Texas A&M. Don't buy into the hype of the best players will be there. They won't and weren't. Due to Covid - we weren't even allowed in the stadium and there were ZERO scouts there, and no coaches obviously (due to NCAA Dead Period, even TX A&M wasn't allowed in their own stadium for this event). We wanted the reps only. So with that in mind it was a successful, though expensive event. He also got top honors as the top prospect there, which was good, but the competition was not there.
Another benefit of a showcase is an opportunity to get some quality reps in if you can't otherwise (maybe it's early or late in the season). When you travel to these events, don't forget to check out the local colleges in the area and drive/walk around campus. Very important to see the schools (and the cities they're in) to put them on the list of contenders. (eg. Duke, GA are not what you expect).
PG Showcases are not needed to be recruited to play college. My son and a ton of others on his team have never been (until a few weeks ago). Playing in PG events on the other hand, way more valuable and visible to coaches.
You can research on the forums here for comparisons PG vs PBR (franchises, some are better than others like NY/PA...TX is HORRIBLE) vs Baseball Factory (all money makers for the organizations), less so of a recruiting event.
Also be leary of college camps. You need to have a purpose and ability to be truly seen. Some are better than others. Again use the search function and you'll see write ups for various camps.