Ran and walked for 60 minutes in the morning over at WVC. Mostly I ran. I had no calf problems (not even a glimmer) so I'll proceed to get back to normal.
The major changes are:
Judicious use of the foam roller.
Gradual addition of the Wharton technique or slant board stretching beginning in October.
I recognize that calf tweaks can happen seeming out of nowhere. I get that in spades.