Hey Nancy!

 NB> Any chance that might have been your local flock, having moved a
 NB> ways....?

Possibly.  I have no idea how far they wander but given the frequency I used to
 see them before mid May I thought a few city blocks might be the extent of
their range.  I am basing this on earlier evidence of spotting a different
flock in the school yard, which is roughly two city blocks away, after spotting
 the local flock in my back yard a few minutes earlier when driving to town a
couple years ago.

 NB> Does human activity arounf your area decrease after Labour Day...?

Yes.  Even moreso after Canadian Thanksgiving (second Monday in October). 
After that it is just what we in the neighbourhood call regulars.  I have been
a regular for about 17-ish years now.

Life is good,
Maurice

... Cybertoasts of note:
    2019-01-01 is  137 days from now and falls on a Tuesday.
    2024-11-05 is 2272 days from now and falls on a Tuesday.
--- GNU bash, version 4.4.23(1)-release (x86_64-silvermont-linux-gnu)
 * Origin: Little Mikey's Brain - Ladysmith BC, Canada (1:153/7001)