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Thanks for clearing up the confusion, I had not considered this
alternative interpretation of even and odds weeks.
And thanks for sharing the tidbit about 53-week years. Should I
mention there are months with a fifth Monday as well? ;-)

So, I would like to clarify that I am proposing meetings on odd ISO
week numbers. This is an initial schedule, which we can adapt based on
project activity.

On Thu, 20 Aug 2020 at 21:34, Jeremy Stanley <fungi at yuggoth.org> wrote:
>
> On 2020-08-20 13:37:53 -0500 (-0500), Sean McGinnis wrote:
> >
> > > "biweekly-odd Occurs on odd weeks (ISOweek % 2 == 1)"
> > >
> > > "Odd/Even and week numbers are based on the ISO week number. ISO
> > > weeks can be checked with %V in GNU date(1)"
> > >
> > > I think some people have assumed it's even/odd week numbers in a
> > > month rather than even/odd week numbers counting from the epoch.
> > > Technically we have frequencies like "first-tuesday" and
> > > "third-tuesday" to address specific week numbers in a month rather
> > > than truly alternating weeks.
> > Based on the existing description, that appears to be the intent. So it
> > had been the first and third weeks of the month, so therefore the odd
> > weeks. But then we at least have a mismatch between phrasing used and
> > what yaml2ical generates, so the description does need to be updated.
>
> And even I'm easily confused by this, as evidenced by the fact that
> above I confused epoch weeks with ISO annual week counts. As the
> README.rst suggests, if you have a "53-week" year then you get ISO
> odd weeks back to back between the end of that year and the start
> of the next, or a pair of ISO even weeks which are three weeks apart
> instead of two.
> --
> Jeremy Stanley