I found this group:
Yorkie Power Playgroup (Akron, OH) - Meetup You can check meetup.com to see if you can find anything else...
As for occupying them in the house during the winter (I know - this sucks! LOL)... I do a lot of training with Jackson which tires him out mentally. We use clicker training.
We also do a lot of indoor fetching... He loves those Kong squeaky tennis balls (they come in 4 different sizes) and I throw them down the long hallway. He also likes the Cuz ball and anything that squeaks and is rubber basically, LOL!! To tire him out more, sometimes I sit at the top of the stairs and throw it down the stairs, so he's running up/down the stairs to drain his energy.
They have puzzle games for Dogs, things like Hide-a-Squirrel and Nina Ottosman dog puzzles. Also Kong is great. You can stuff food into them and keep them busy for a while. Of course bully sticks and Himalayan chews are a hit in this house too!