Update 2:
I stopped using this cal app. A few bugs that are just deal breakers. Disappointed but moving on. Built in calendar app in iOS 9.3 good enough, now.
One star deducted for an OLD bug (on iPhone) not getting any attention. Press and hold on day view to create a new event and after a while (about 4 new events) the "new" doesnt show up, effectively breaking the press and hold to create a new event. I kill the app to get that function back.
With all the calendar app competition, and Ive checked out a bunch, I love this calendar app.
When traveling, there is something really annoying and it is probably an IOS bug.
When traveling to a different time zone, the times of all existing events are changed to reflect the new time zone.
It really hurts if you enter an event with your flight time!
I entered the location info in the event for my return flight (the city of departure), thinking IOS or weekcal would not alter the event time if I travel to that location. Not really.
Luckily I havent missed a flight.