re: Red, black and white demask 40th cake

We experience air bubbles all the time, and I still cannot understand why. Could it be the humidity in the air? I’m with Julez about refrigerated cakes that warm up, as I found that the problem seems to have increased since I refrigerate the cakes while ganaching them. Sometimes we get tens of small bubbles, sometimes just a few that tend to grow bigger and bigger. I told my girls to keep a scriber needle on hand and pierce those nasty bubbles, just as Fifi suggested. It works, but I still have no answer to the main question: where do air bubbles come from? If we can find this answer we should be able to prevent the problem.
Your cake looks fabulous anyway, Sharon!