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Bad: Due to the limited screen size of phone, the time slow selection can not show all the time slot slots in one window. A user has to scroll down and make a selection if he wants to choose 8pm for example.
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Good: The fact that things are selectable with a one single touch makes it easy to recover from errors. Say a user choose a wrong time slot when picking a date. she She can then just simply press on that time slot again to unselect. Another thing that helps with safety is that the autocomplete in the search box. The user can easily select invitees from the list without making spelling errors. The history features which would be incorporated to inviting people window will allow people to choose invitees from the list of previously invited people. Therefore, reinviting people to an event is almost error-free.
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