No license needed.
Lots of fishing options at that time. My brother and I will likely be focused on the SBFT if they are around. Good bass and blue fishing around Boston and on the cape you can add Bonito, Albies and Spanish Macs to the list.
Am I reading that right - you will be available only in the evenings on those days? If so then the best fishing list narrows to Bass. I'll let others handle the where's as I do not know the Boston area well at all.