Due January 2025 for existing members.
Last possible date to join for new members is 31.8.25
Renew using the form here Join Us
Another way to add the calendar. If the above does not work on your phone (e.g. you have multiple google calendars/IDs) then you can add this calendar to your phone by explicitly adding this calendar: https://calendar.google.com/calendar/u/0?cid=Y184bW5jOG4zazN0cXByN2dua29iaXI3cGh2NEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t