Timezones solving time picker widget for new meeting event creation
In addition to supporting timezones natively in weekview (bug #753135), there is significant room for improvement in the dialog that shows up when creating a new custom event.
So, in that dialog, instead of a "dumb" time picker widget that only lets you flip hours and minutes numbers, we could have a "time slider" widget exactly like what you see on http://www.worldtimebuddy.com
…automatically pre-populated with the cities configured in GNOME clocks/weather/etc. (with the ability to add another timezone/city on the fly of course).