Getting those 7 dwarves takes some great timing and good luck! We seen them only at MNSSHP and Characters in Bloom weekend in May at Epcot. I heard of them being out in Town Square at Magic Kingdom in busier times, like a few times during the summer, and I think I heard they were out around Easter, too. I did not see them at MVMCP last December, though. If they are out, more often than not they do group photos with no autographs. Though at Characters in Bloom weekend at Epcot, I did find them doing individual photos and autographs. But this is not the norm - usually it's group photos only!