@elitef first create a new room … like if this is outdoor lights call the room Outdoor. then create the holiday light routines under holiday settings within this Outdoor room.
then in maintain rules create a rule with conditions when these lights should be turned on and set the lights in the switches on parameter. then below switches on use the level drop down to select the holiday light routine.
the dumb switches off course have to stay on but the rule will turn the lights on and off based on the rule you create. the rule can include both date and time as well as other conditions to check.
more details in the 1st post in this thread:
EDIT: there is 1 DTH and 4 smartapps to save and publish. please make sure those are done before creating the room within rooms manager. 
- rooms occupancy DTH
- rooms manager smartapp
- rooms child app smartapp
- rooms child settings smartapp
- rooms vacation smartapp
easiest if you do a github install. github details in that thread towards bottom of the first post.