Why does my greatroom have a GFI breaker on the circuit?
Given the locations for these breakers and source of trips, I'm guessing they are actually AFCI breakers. AFCI are designed to detect an arc fault, e.g. a failing extension cord that is at risk of causing a fire. They are required in bedrooms in newer electrical codes. Vacuums frequently trip these because the motor itself gives off a lot of noise in the line that resembles arcing (or perhaps there is some arcing inside the motor).

Since you are seeing it now, look for anything that may have changed, like your holiday lights. Try leaving those lights off for a while to see if the trips stop, and if so, inspect the wiring. Twinkling lights would be another suspect as they turn on and off with a heated element that is likely generating a small arc as it does so.