comments above seem accurate to me. Have done both Showball and HF in the last year with my 2019. Our experience with HF was there were coaches available to talk between games, just not all the coaches, all the time. Showball was a little more challenging getting with the coaches but I think that's because HF practically forces the kids to engage. Their booklet is very helpful, too. Showball does use a second field that in SF apparently will be only a few minutes away from SF State for the overflow. Coaches stay put; kids rotate. So all kids should be seen, just not at the same time. I think the early games especially on the second day are better attended at each event than the last games.
Liked both events, though son preferred Showball. He thought the second day of HF was exhausting. Two notes that may reinforce what's above. Go to the event where most of your target schools will be, and let them know you're coming a few weeks ahead of time. Especially helpful to include a video, and then have your kid seek these coaches out at the events. I've had a few great conversations myself with coaches at these events, but I've only tried to talk with coaches of programs my sons are NOT interested in.
final note: give your kid at least one full day off between events if possible. These things are stressful for the kids, it's usually very hot, and there are few shady spots at each field.
Good Luck!