The most bonkers thing (and there's a lot...), is the idea of you rebooking plane tickets home and cutting a visit to your family short because it unsettled your child.
The level of anxiety that you must have, to think that's a reasonable solution to an unsettled child absolutely blows my mind. You could take your child for a walk, you could try introducing a family more slowly, maybe one at a time, a thousand different things, cancelling the entire trip. What the actual hell.
If this is representative of how you parent, are all on you.
And of course you are toddler doesn't want to sit in a buggy of what you have an espresso. That's why parents (half) joke about not finishing a cup of coffee in 5 years. Your expectations are crazy. Yes, you'll get a few toddlers that will sit at circle time and sit nicely for a drink (probably not in that buggy!) but the vast majority won't, and those won't be at circle time, because and they'll choose more active activities.
If you're a vegetarian you don't go to a steakhouse. If you've got a lively child, you don't go to libraries rhyme time 😂
Oh and my child who was pretty good at circle time, now, she's at school, is being investigated for ADHD. Do I think of her as disabled - no. That's my other child.
Stop looking for problems. If they're there, you don't need to go hunting, they'll find themselves.