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Calfw is nice, but doesn't support recurrent events, which may be a deal-breaker. https://github.com/kiwanami/emacs-calfw/issues/8 (it was for me).
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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- Org-Caldav
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- Org-gcal
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Have a look at vdirsyncer. Sync calendars to a local directory and then use eMacs to read them.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.