[python-events] Add PyCascades to Python Events Calendar

[Esti Shay]

Please add the following event: * name of the event: PyCascades 2021 *
type of event: conference * focus on Python: * approximate number of
attendees: unknown * location (incl. country): Portland, Oregon, USA *
dates/times/recurrence (incl. time zone): Feb 19 - 21, 2021 PST * HTML
link using the format <a href="http://url/">name of the event</a>: <a
href="https://2021.pycascades.com/">PyCascades 2021</a>



-- 
Esti Shay
Communication Chair
PyCascades 2021
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