Yes, you can, but we recommend to not overlap your daily timer with a calendar event. For example, you can create a calendar event for a holiday and set it to run from 7;00 p.m. to 11:00 p.m.. Then you could set a daily timer to come on from 11:01 p.m. to midnight or even to 5;00 a.m. As long as the timers to not overlap they will work correctly.