In case anyone needs it I've updated my Mercury Retrograde google calendar to reflect 2023 dates https://calendar.google.com/calendar/u/0?cid=dGdkNXJsbDMzcmJ2aW03a2UybDlhMjZwbDRAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ