Rather than wait 20 minutes, standing out in the cold, I walked up and down a sheltered walkway (cool enough, in its own right) to get the blood circulating, keep warm (-ish), and get some more of the day's step count in.
For part of the course of this modest exercise, I overheard part of a conversation (nothing of any delicate nature). There was a fellow Bostonian, and a friend returning to Boston from Montana. The returnee expressed regret that "the Garden" was no longer the Garden. The welcomer offered reassurance: for a while it was "the [name of former corporate sponsor] Center," but now it is "the [name of present corporate sponsor] Boston Garden."
The returnee was mollified. For myself, mercy upon me for reflecting that, the name notwithstanding, there cannot have been anything remotely garden-like about this venue for many decades.