add Data Umbrella: Polars event

[reshamas]

cc: @stefanv

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[stefanv]

Thanks @reshamas! The preview looks good.

[stefanv]

🎉 https://scientific-python.org/calendars/ and https://scientific-python.org/calendars/data-umbrella.ics — I'm subscribing :)

[stefanv]

@reshamas BTW, the calendar entry here is for one hour, but the one sent by the event platform is for 2 1/2.

[reshamas]

@reshamas BTW, the calendar entry here is for one hour, but the one sent by the event platform is for 2 1/2.

It should be 1 hour (sometimes the webinar runs a bit over, so we add a buffer). I've updated the BigMarker link. Thank you.