Here are chairs laid out at the back of my class. The classrooms are not very big (14 desks max) so the addition of parents made it a tight squeeze. Notice how I neatly laid out brochures and pencils (thanks to my days working in banquets at the Delta Victoria)
Drawing images on the board is a great way for students to understand and comprehend what's going on in a story. Here's a little scene I erased just before the parents arrived. A group of men are lost at the South Pole while exploring in the early 1900s. A seal was about to attack one man but his buddy with a rifle comes and saves the day. Notice the effects of a red marker to indicate blood. Hee hee.