This isn't a trip for his year group but they are organising a language trip to an EU country by air, leaving on, guess what, 29 March!
I think they come back on 3rd April or thereabouts.
I am a bit surprised to say the least. Do they have inside information that there will be a deal? They've also got a EU trip planned later in April but that was organised months before all this latest no-deal furore, and another one in July, but I'd probably expect things to have been sorted out (to an extent) by then, although they might have to get visas for the British passport holders at shortish notice.
Leaving on 29th seems like playing chicken to me; the kids (and teachers!) might not be able to get back.