Here is the map for the 2016 F&G on WDW Magic. Butterfly house is #40, near Imagination, and Festival Center is in the old Wonders of Life Pavilion in the NE corner, as stated by PP.
Not sure what or where the Greenhouse Stage is. America Gardens Theater is in front of the American Adventure.
Easywdw has comprehensive reviews of the outdoor kitchens in three parts.
Here is Part 3 with links to the first two.
Here is the lineup of performers for the Garden Rocks Concert series on WDW Magic.
We're really looking forward to spending time at Epcot on our upcoming trip. DW and I will be taking advantage of the Sandcastle (kids) Club so we can have a "mommy and daddy night out" to take in some music and sample food and drinks from the outdoor kitchens. We've talked in the past about taking a trip without the kids for Food & Wine, but the more I read, the more I'm glad we'll be there for F&G instead. And a single night out for the incremental $165 for three kids at the Sandcastle Club is a lot cheaper than a separate F&W trip.