We have different milestone dates that are currently being captured in Custom Fields that I would like to also be able to visualize on a Calendar.
Current Work-around: What I've been doing as work-around is to change the Due Date on the task to match the specific milestone so it will show in the calendar that way, (and append the task name to reflect the kind of milestone due date), however it's tedious to change the due dates and task name to reflect that all the time.
Suggestion: Wrike Calendars that are "Smart based on Tasks" is really helpful to visualize due dates when selecting "End Date" for Task Duration to Display. The ability to create calendars that display Custom Field dates as an end date would allow calendars that display the same tasks, but showcase the different kind of milestone due dates.