Depends on what your interests are. ??
Maritime or the Public Safety Response ?
Marine ? Put all the VHF Marine Channels, the VHF and UHF USCG LMR and CG Aux
United States Coast Guard - The RadioReference Wiki
Marine VHF Channels - The RadioReference Wiki
Public Safety ? Not much is different than the normal day-to-day channels
except many of them will be patched, to include the
NIFOG Interops
Boston PD, FD, EMS, Massport, DCR, surrounding PD's [Winthrop, Quincy, etc] incluiding Marine Patrols, Metro Fire, BAPERN
https://www.radioreference.com/apps/db/?ctid=1225
https://www.radioreference.com/apps/db/?aid=3499
Many of these channels are also used on a regular basis, for standard Interop
You can also monitor the
SNE Wiki for updates as found/identified
What would be the best frequencies to listen to this weekend for the Sail Boston event