No one knows quite how this is going to work yet since they haven't had these two events in the same park before. World of Color has run nightly since its inception except for the rare cancellation or refurb. Paint the Night pretty much ran nightly during its previous run at Disneyland. If they are both to run nightly, then obviously the timing would have to be arranged so that they don't overlap since the parade route is pretty close to the World of Color show area. My guess is that each show will run at least once per night. They might even have time to run Paint the Night, then World of Color, then another Paint the Night, especially if they want to extend park hours; DCA doesn't often stay open later than 10 PM.