'They' wanted to have each of their own vehicles and it's 'their' common area of business and leisure. It doesn't matter whether there's a big event in that area or not, as long as 'their' business continues to run properly and freely.

And 'they' are used to these type of 'parking shortage', don't worry.

"Everything in this book may be wrong." Illusions: The Adventures of The Reluctant Messiah by Richard Bach