dev/core#2122 - Add an event timezone for sample data

[demeritcowboy]

Overview

The public demos are showing a warning every day about events with missing timezones. While it's a good test of the system check, I think the sample data should set a timezone for them.

Alternatively, could add something to buildkit for the demo sites.

[civibot]

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[seamuslee001]

This makes sense to me tbqh merge on pass

[demeritcowboy]

Thanks!

[eileenmcnaughton]

@demeritcowboy thanks for all your hard work shepherding this change through - I know you helped @agileware-fj get it over the finish line!