A very short update
I'm back home with only about one hour of delay. I also located my mobile phone - battery dead as a mummified pharaoh - in a pair of shoes I decided not to take with me last minute. Off to make a bunch of phone calls, sift through a huge pile of snail mail and I don't even dare looking at the amount of e-mail awaiting me. (I just looked : only 511 messages, most of them spam, phew!)
Update : I got a call around 21h55 from someone at work, wondering whether or not I was coming in for a night shift. I explained I had our site supervisor give me the days off two weeks ago and that he confirmed by mail. Apparently, he "forgot" to arrange someone to replace me. Never mind, I won't be going in for work.