I think I could be available any weekend. The Silvers have the best fares the second and third weekends. The last weekend may have the "warmest" weather (and the highest NYC hotel rates), but may allow me to stop by the RPA conference in Alexandria, VA on the way home for one day of the conference. I am in communication with RPA now to see if they will offer me a reduced registration fee for one day attendance.
Also, the last weekend will have more daylight than the first weekend. DST starts 3/8.
Bottom line, unless something unexpected comes up or the Silvers sell out, I think I can attend (for at least one day) any weekend.