I'm using the new calendar interface.
Following your suggestion I did the following:
From the visual perspective I'm running a process:
DISPLAY 'All Tours Calendar' whereby All Tours Calendar is the query that displays my calendar.
In the above query I changed the standard edit behavior to call a process:
VIEW Tours
This indeed brings up the Tour with the missing buttons, but the form only shows a save button. Pressing this will save the record, but will not close the window and bring back the calendar.