This lets you explore your calendar data without needing to setup API access and deal with authorization to your calendar software's API. (common ones all have .ics exports readily available)
Combine this with CSV tooling and you got yourself some quick and easy calendar data analysis / exploration setup.
Hope you like it!
CSV utilities (still haven't pick a favorite one...): https://github.com/harelba/q https://github.com/BurntSushi/xsv https://github.com/wireservice/csvkit https://github.com/johnkerl/miller