add a single event by selecting only a few days in the month and not the whole period

[C2]

when I add a new event I can only enter a period (start date and end date - in type Date)
for example event 0001 starts on September 10th and ends on September 15th, the whole period is correctly reported on the calendar.
I would like only some days to be selectable:
for example event 0001 takes place on 10 12 and 15 September and that the result was shown on the calendar

thanks

[1minManager]

Each calendar entry has to have at least a start and end date for each record

[C2]

Is there no possibility to set an event (with same uni code) on two separate date?