For the IT stuff the weekends and holidays are often the times of full work when infrastructure needs to be changed or updated. During these times there are less users affected. I don't say none because I know companies where there is nearly always somebody working.
I wish everyone a relaxed set of holidays and my special wishes go to those who have to work.
For those who will do major changes during these days, remember to plan in time and check the availability of required suppliers in case something unexpected happens!