A charcuterie board with meat and cheese should be served lightly chilled. It should be fine at room temperature for a couple of hours before being put back in the fridge to store. If you're going to have it out for more than a couple of hours, have backup food items in the fridge that you can rotate onto the charcuterie board (and put the originals back in the fridge) so nothing is out for more than a few hours.