Add upcoming DU event [A Tutorial for Getting Started with PyMC- Christopher Fonnesbeck]

[SangamSwadiK]

Related Issue: #784

Hi @reshamas I've added the event, but should I change the time to 16 UTC? as that's the time on the meetup cover image?

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[reshamas]

@SangamSwadiK Thank you for the PR.
Looks like the linter is not happy. Can you check the end of lines spacing?

mixed line ending........................................................Passed
trim trailing whitespace.................................................Failed
- hook id: trailing-whitespace
- exit code: 1
- files were modified by this hook

Fixing calendars/data-umbrella.yaml

prettier.................................................................Failed
- hook id: prettier
- files were modified by this hook