Christmas plans?

Today I had dinner with my parents for the first time in something like two weeks. Up to this point, I'd been seeing them about once a week and after we surpassed the one week point I started getting near-daily texts at really inconvenient times that I just couldn't respond to. This obviously really freaked them out. What freaked them out even more was the fact that when they told me the dates of a cousin's wedding a year from next month, I really needed to write them down for apprenticeship applications. Even more than that, they were upset when I told them I didn't know how long I could be with them over Christmas at the lake house because, well, I might have rehearsal. I have had a lot of time to slowly get used to how much time I have to dedicate to being a theatre professional, but I just don't know how easy it's going to be for them to process it. To be fair, they are a lot more relaxed about the fact that I need to come home the day after Thanksgiving to run a Board meeting than they were two years ago and the fallout I was expecting about this winter was limited to "Don't they have to give you off Christmas?!," but I just don't know how to break it to them that I'm going to have to start missing family things a lot earlier in my life than they perhaps had planned... unless they can schedule them a year and a month in advance.