Is there a way to make it so that you can only reserve rooms from say July 15th through July 27th? Or something similar. From one date to another and otherwise the room(s) are not available?
Unfortunately, at this time there is not a way (nor any easy modification to make) that would allow you to specify a specific time period (start/end date) by which a resource is available.
...describes how to limit how far reservations can be placed in the future... but that is always based on the current date... and not a specific start/end date that you're looking for.