We'll, you just never know. In late June, we had a morning flight out of CDG. Our plan was to check in and, then, have breakfast in the lounge as we normally do. When we got to the airport three hours early, there was a sea of people unlike anything I've ever seen in any airport. There had been a security problem and most of Terminal 2 was closed. Unfortunately, people kept coming and coming with no place to go. It was a complete nightmare. Fortunately for us, our business tickets gave us access to a priority lane that allowed us to bypass thousands (no exaggeration) of people. We still had quite a wait before I could get our passes and it was quite hot and stuffy in there. Just as I was finally getting the boarding passes, my husband started getting dizzy and soon he was on the floor (but alert). That brought the paramedics and they decided he should be seen by a doctor. So, we headed off by ambulance to the airport medical facility. That took forever, but he ended up walking out of the examining room with a clean bill of health. We think that the problem was that he hadn't had anything to eat or drink because, with all of the disruption in the terminal, we never got to the lounge for breakfast. Lesson learned here - Carry Kind Bars, or something like that, and water.
We left the medical office and had a long walk back to Terminal 2, which was still a sea of people. Then, a train ride and another long walk, but luck was with us again and the Priority lane was nearly empty, so we ended up at the gate just as boarding was to start. We were feeling very lucky . . . until we scanned our boarding passes and they were rejected. The airline had canceled our seat reservations when they took us to the medical facility. We did finally get seats and we're back home and ready to go again.
I have no idea if flights were held due to the closure in the terminal, but I can't imagine that all of those people got on their flights. Obviously, this was a day when arriving at the airport early was vital and there was no getting around standing for a long period of time. My husband wasn't the only person we saw passing out that morning, so I also would recommend that you order wheelchairs given your concerns.