Other UES Moms/Grandmas for toddler playdate/playgroup?

Hi, I work 3 days a week in midtown and am fortunate to have my mom watch my 2 year old son during those days. She lives on the UES. I am interested in occasional playdates for him when he's with Grandma. She is 50-something, but is more like 40-something. Preferably 1.5 - 3 years olds - non-agressive please. Thank you. Feel free to email me at: mom2jared04@yahoo.com