Yep it's at The Garden Grill and is at 3pm and 3.30pm each day (as far as we know).
It's $6.95 each and is an ice-cream sundae served in the GG booths - ask to be on the bottom tier to watch the scenery as you revolve. The characters are Farmer Mickey, Chip n Dale and Pluto. Whenever we've been, it's been quiet so you get lots of Character interaction - though that was March each time.
The restaurant is still serving their lunch menu at the same time so you can choose to have 'the social' or a meal to suit and still meet the Characters.
HTHs