is it possible to disable events from clashing

what i’m try to do is to disable creating redundant events… as example, after created first events with the start date 2013-10-11 02:00 am - end date 2013-10-11 03:00 am…and 2nd event is 2013-10-11 02:15 am - end date 2013-10-11 03:00 am… to create 2nd event, is it possible to avoid from clashing…i don’t want any events are created between range of 2:00 am - 3:00 am… i tried to look at the documentation, nothing found for this answer… need your help.

It possible to define how many event can occur in the same time
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thank you for your help…it solve now