Is it appropriate to email some new information to my recommendation-letter writers on Thanksgiving if the deadline is a few days later? I just found out one of my grad school electronic applications is having problem with a third party letter service company. So I have to ask the letter  writers themselves to upload the recommendation letters. The deadline is the first day after returning from Thanksgiving so I am thinking to email them today (Thanksgiving) would that be inappropriate? (But if I do, of course I will say Happy Thanksgiving but sorry to bother you....etc)
Asking is always possible.
Expecting any response or action ... well, that, as they say, is another story.