No classes on full or new moons.  
Times given are specific to Santa Cruz:

2024
December 15 - Sunday - Full Moon, 1:01 AM
December 30 - Monday - New Moon, 2:26 PM

2025
January 13 - Monday - Full Moon, 2:26 PM
January 29 - Wednesday - New Moon, 4:35 AM
February 12 - Wednesday - Full Moon, 5:53 AM
February 27 - Thursday - New Moon, 4:44 PM
March 13 - Thursday - Full Moon, Total Lunar Eclipse, 11:54 PM
March 29 - Saturday - Super New Moon, 3:57 AM
April 12 - Saturday - Micro Full Moon, 5:22 PM
April 27 - Sunday - Super New Moon, 12:31 PM
May 12 - Monday - Micro Full Moon, 9:55 AM
May 26 - Monday - New Moon, 8:02 PM
June 11 - Wednesday - Full Moon, 12:43 AM
June 25 - Wednesday - New Moon, 3:31 AM
July 10 - Thursday - Full Moon, 1:36 PM
July 24 - Thursday - New Moon, 12:11 PM
August 9 - Saturday - Full Moon, 12:55 AM
August 22 - Friday - New Moon, 11:06 PM
September 7 - Sunday - Full Moon, 11:08 AM
September 21 - Sunday - New Moon, 12:54 PM
October 6 - Monday - Full Moon, 8:47 PM
October 21 - Tuesday - New Moon, 5:25 AM
November 5 - Wednesday - Super Full Moon, 5:19 AM
November 19 - Wednesday - Micro New Moon, 10:47 PM
December 4 - Thursday - Super Full Moon, 3:14 PM
December 19 - Friday - New Moon, 5:43 PM