With the change from `aside` to `section` for blocks within the main
content region, the selector for instances of the calendar block not in
the main content region also needs to be updated to use a more generic
selector that can cover when either the blocks container containing the
calendar block is an `aside` or a `section`.
The `data-blockregion` attribute is a good selector for this purpose.
Jun Pataleta
0088376633