I used to call them all at 6 months, and if someone sounded like they really do not want to be bothered, leave it at that.
I pretty much let them contact me, and try to take time with any that do. If they call and for some reason I need to cut the call short, I always try to get ahold of them again to ensure we covered everything.
Some I have gone to training with and to shows with. Some I have visited at their homes.
Some, I don't hear from.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.