Node-RED
Only handle events not started aka future events
flow description
The first flow get all events from the currect day by setting pastview = 1 and preview = 1.
The seconds only gets future events by setting pastview = 0 and preview = 1.
flow json
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HomeWorking daily alarm in the morning
Define two events in the calendar, one for HomeWorking days (allday event at MON,TUE,WED,FRI) and one the the alarm (event from 05:50 to 06:30 at MON,TUE,WED,THU,FRI). So thursday is not a HomeWorking day 😉
BEGIN:VEVENT
DTSTART;VALUE=DATE:20211105
DTEND;VALUE=DATE:20211106
RRULE:FREQ=WEEKLY;WKST=MO;BYDAY=FR,MO,TU,WE
DTSTAMP:20220205T113246Z
UID:homeoffice-uuid
CREATED:20211105T114802Z
DESCRIPTION:
LAST-MODIFIED:20211117T094702Z
LOCATION:
SEQUENCE:2
STATUS:CONFIRMED
SUMMARY:homeoffice
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20200121T055000
DTEND;TZID=Europe/Berlin:20200121T063000
RRULE:FREQ=WEEKLY;BYDAY=FR,MO,TH,TU,WE
DTSTAMP:20220205T113246Z
UID:alarm-uuid
CREATED:20200120T170922Z
DESCRIPTION:
LAST-MODIFIED:20200124T181506Z
LOCATION:
SEQUENCE:1
STATUS:CONFIRMED
SUMMARY:alarm
TRANSP:TRANSPARENT
END:VEVENT
flow description
place a 
, which gets triggered when the alarm event occurs. In this example the start output at 05:50 and the end at 06:30.
place two 
, which check on start and end if it's a HomeWorking day.
If it is a HomeWorking day:
delay the wakeup light for 15 minutes and don't switch it off on the end events.
If it's not a HomeWorking day:
switch on the wakeup light instant on eventStart at 05:50 and switch it off on eventEnd at 06:30
flow json
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}","dateformattype":"json","language":"en","languagetype":"language","filterProperty":"summary","filterPropertytype":"filterProperty","filterOperator":"between","filterOperatortype":"filterOperator","filtertype":"str","filter2type":"str","filter2":"","filter":"homeoffice","combineResponse":false,"x":430,"y":200,"wires":[["b87ace3b.14223"],[]]},{"id":"7617c7bb.238228","type":"delay","z":"449ac5d34f0c17e8","g":"4f79424fc04dbb0b","name":"","pauseType":"delay","timeout":"15","timeoutUnits":"minutes","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":870,"y":180,"wires":[["be97b055.2c3db"]]},{"id":"be97b055.2c3db","type":"template","z":"449ac5d34f0c17e8","g":"4f79424fc04dbb0b","name":"set hue lamp to 100% over 10 minutes","field":"payload","fieldType":"msg","format":"json","syntax":"mustache","template":"{\n \"brightness\":100,\n \"transitionTime\": 600\n}","output":"json","x":1130,"y":200,"wires":[["2b3f38db.c45788"]]},{"id":"bfdda842.f81eb8","type":"ical-events","z":"449ac5d34f0c17e8","g":"4f79424fc04dbb0b","confignode":"feadad7e6f14505e","timeout":"4","timeoutUnits":"hours","cron":"","name":"","offsettype":"num","offset":"","offsetUnitstype":"offsetUnits","offsetUnits":"minutes","eventtypes":"events","eventtypestype":"eventtypes","calendar":"","calendartype":"str","triggertype":"trigger","trigger":"match","timezone":"","timezonetype":"str","dateformat":"{ \"timeStyle\": \"short\", \"dateStyle\": \"short\" 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