As a TV viewer, I don't care about outdoor games, but they're apparently still a spectacle in person. It's not like they struggle to sell tickets.
Boston is a logical opponent (although you could argue Tampa Bay vs Hurricanes). Espo played for the Hawks and Rangers, but is most synonymous with the Bruins. We also had a rivalry with them from 2011-2020ish. If we're concerned about too much black and gold, then NYR could work.
It's like the Emmy's. They don't give credit to shows in their peak. They wait a few more years for when the quality starts to drop off, and the budgets are ballooning.
I don't know who the Panthers would play. Their biggest rivalry historically is with themselves. Philly sounds about right for some reason.
Chicago getting two outdoor games is still the most likely outcome.