For all the holidays to work on here, we need a timetable for the seasons and all that junk; here it is.

Every month is a season, so every 4 months are a year, here's the key:

January: Winter (Midwinter Fes.)
February: Spring
March: Summer
April: Fall
May: Winter (Midwinter Fes.)
June: Spring
July: Summer
August: Fall
September: Winter (Midwinter Fes.)
October: Spring
November: Summer
December: Fall