In Our Haggadah: Uniting Traditions for Interfaith Families, NPR couple and authors of a syndicated USA Weekend column Cokie and Steve Roberts discuss how they merged their faiths -- she's Catholic, he's Jewish -- with an annual Passover seder as their own annual peace accord. Wednesday, March 23, at 7 p.m. Sixth & I Historic Synagogue. 600 I St. NW. Tickets are $12 each, or get two free with purchase of the book from Politics and Prose. Call 202-408-3100 or visit sixthandi.org.