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webcalendar
WebCalendar is a PHP application used to maintain a calendar for a single user or an intranet group of users. It can also be configured as an event calendar.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Then all you need to do is host your calendar on the Pi and there are many https://github.com/craigk5n/webcalendar as an example
NOTE:
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Hence, a higher number means a more popular project.