I attended a RPM the other year. That was about six miles from my home. This particular show alternates between Pittsburgh and suburban Phila. The presentations and clinics started Friday evening and concluded Sunday morning with open houses Sunday PM.
Some of the same presenters at that show are on the docket you provided. There are two weathering presentations, some history, prototype, electronics, and construction of structures and cars among the group. It's like a combo of the Fine Scale show and a well-prepared regional NMRA meet. For $25, you can't beat it.
I would guarantee you will come away with ideas and suggestions that would take you years to come up with on your own. And you will no doubt meet many well known modelers as well as possibly encounter a couple acquaintances.