Chabad lets you send FREE virtual greetings to friends and family for Pesach, There are virtual cards suitable for children, for grownups, even an invitation to join your Seder. All free.
Passover continues for eight days and ends at sundown on Tuesday, April 22nd. Once again this year, that means Passover 2014 overlaps Palm Sunday and Easter Sunday. And this year, the last day of Passover is also Earth Day.
The Chabad website also has a list of local Seders to attend nationwide. Here is the link to New York City seders at synagogues and community centers.