Thank you for your post District11. I have no direct knowledge of the oil industry. The comments about oil workers having no say whatsoever as to their schedules perplexed me but what do I know? I'm not a part of that world so I have no right to or basis for argument.
Here's what I do know. As the long suffering wife :blushing: of a soldier, who in later years had authority over a lot of troops, I know that a soldier who has a special reason or an important event coming up can always ask for leave or a day off. There is a person, who is usually approachable, in charge. Therefore, I find it almost impossible to believe and quite severe to think, that a man with considerable autonomy (owns his own business) could not plan ahead and arrange to have a particular day off ~ the day his son is graduating from high school. Shy of a regional emergency (or in soldiers' cases a global crisis where suddenly whole battalions are alerted to prepare, pack and get ready to deploy), usually humanity allows for reasonable grace when it comes to making allowances for employees to be there for family members, especially when it comes to relatable special days in one's life.
That said, as a military wife, after awhile I caught on that some soldiers did not want their spouses to know that they could always ask and their request would probably be granted. They made the Army their excuse.