The National Association of Theater Owners has decided to delay its annual CinemaCon event from late April to the end of summer, and the next edition will now take place Aug. 23-26, 2021. CinemaCon happens to be one of my favorite events on the industry calendar, and I greatly enjoy my pilgrimage to Las Vegas each year -- not just for gambling purposes, but because it calls for four straight days of watching movie trailers, which my friends and family know is one of my favorite things in the world. This year's CinemaCon was cancelled due to the pandemic …