I've had a multitude of experiences --- going to a lot of conferences and professional workshops and too-many-weddings to mention...some I call and are clueless. Others I'll call and they are so extremely spot on and have a full-on process for dealing with it (prepping NEW foodstuff for a separate cooking/preparing and setting aside MY PLATE full of food, labeled, with foil/wrap, etc.) it's amazing to me.
Sometimes it's a PITA and I don't even bother. I've got it down now for conferences/workshops where I'll bring my own lunch. I have pn/tn/shellfish allergies...so I can do most foods. I'll hit a grocery store for a block cheese, box of crackers, apples, grapes, red pepper, carrots...and bring a cutting board/knife and plastic baggies or containers in my check luggage. Easy peasy lunch that doesn't really need refrigeration. For the cheese...I'll wrap it and put in the ice bucket overnight.
Sometimes they'll say they'll make a special plate for me of something completely different. I usually ask. If it's "plain pasta or rice" or "a salad" I will happily tell them "never mind...I"ll bring my own food." as I've experience many a super crappy lunch at a workshop "because they tried".
Recently at Boston Univ. (who has a peanut/nut free kitchen) all they could muster (and were SO excited about!!!) was a "grocery store pre-bagged" level salad (it tasted FUNNY) with some possibly-day-old chicken on it. At that...maybe 4 bites of chicken.
Next day --- they found me to give me my plate...I handed them a Gladware container and asked them to go heat it up. I bought Chipotle the night before, I had a fridge, and then brought it in. They were kinda offended...but I was like "That salad yesterday was crappy, and I trusted you to give me a lunch, and I went hungry. Today, in my own hands."
Anyhoo - it varies considerably. Most of the time NOT WORTH THE EFFORT. Bringing my own is ALWAYS easier and less stress.