Sabbat      Trad date  Astro date  Astro date
                       2020        2021
Lughnasadh  Feb 2      Feb 4       Feb 4*
Mabon       Mar 21     Mar 20      Mar 20
Samhain     May 1      May 5       May 5
Yule        Jun 21     Jun 21      Jun 21
Imbolc      Aug 1      Aug 7       Aug 7
Ostara      Sep 21     Sep 22*     Sep 23
Beltane     Oct 31     Nov 8       Nov 7
Litha       Dec 21     Dec 21      Dec 22*

Astronomical dates are good for Australia and
New Zealand, except as follows:
    Ostara 2020 - Sep 23 in NZ
    Lughnasadh 2021 - Feb 3 in WA
    Litha 2021 - Dec 21 in WA

Trad date = Date on which the sabbat is traditionally
celebrated in the southern hemisphere

Astro date = Astronomical dates - based on solstices,
equinoxes, and cross-quarter days