The first issue appears it may be a legit 503 service unavailable issue, but does throw an error into the log.

[2020-10-14 13:34:33.657] [ERROR]  Calendar Error. Could not fetch calendar:  http://p42-calendars.icloud.com/published/2/MjE1NDI5NjM0Mj*MASKED*--sxGM 503: Service Temporarily Unavailable
[2020-10-14 18:53:07.815] [ERROR]  Calendar Error. Could not fetch calendar:  http://p64-calendars.icloud.com/published/2/AAAAAAAAAAAAAA*MASKED*Cj9UqU 503: Service Temporarily Unavailable

I have also seen the following error but they don’t always coincide with the 503 errors so not sure if they are related or not.

[2020-10-15 00:44:37.926] [ERROR]  Calendar Error. Could not fetch calendar:  http://p42-calendars.icloud.com/published/2/MjE1NDI5NjM0Mj*MASKED*--sxGM Error: getaddrinfo EAI_AGAIN p42-calendars.icloud.com
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26) {
  errno: 'EAI_AGAIN',
  code: 'EAI_AGAIN',
  syscall: 'getaddrinfo',
  hostname: 'p42-calendars.icloud.com'
}

[2020-10-15 01:02:13.529] [ERROR]  Calendar Error. Could not fetch calendar:  http://recollect.a.ssl.fastly.net/api/places/03A47F*MASKED*0E18/services/253/events.en-US.ics Error: getaddrinfo EAI_AGAIN recollect.a.ssl.fastly.net
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26) {
  errno: 'EAI_AGAIN',
  code: 'EAI_AGAIN',
  syscall: 'getaddrinfo',
  hostname: 'recollect.a.ssl.fastly.net'
}

[2020-10-15 01:02:41.306] [ERROR]  Calendar Error. Could not fetch calendar:  http://p64-calendars.icloud.com/published/2/AAAAAAAAAAAAAA*MASKED*Cj9UqU Error: getaddrinfo EAI_AGAIN p64-calendars.icloud.com
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26) {
  errno: 'EAI_AGAIN',
  code: 'EAI_AGAIN',
  syscall: 'getaddrinfo',
  hostname: 'p64-calendars.icloud.com'
}

[2020-10-15 01:03:44.890] [ERROR]  Calendar Error. Could not fetch calendar:  http://ical.mac.com/ical/US32Holidays.ics Error: getaddrinfo EAI_AGAIN ical.mac.com
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26) {
  errno: 'EAI_AGAIN',
  code: 'EAI_AGAIN',
  syscall: 'getaddrinfo',
  hostname: 'ical.mac.com'
}

Thanks again for any help!

Rick