The op already said above that the children have people over when he is out, just because he can't cope with aqquitences the op just recently met again to sleep over over doesn't mean he's a crap father as some people seem to be hinting at 
This is such a cringey and sad thread to read as an autistic person and I'm unsure as to the purpose of it, op knows her husband couldn't cope in this situation, others like myself have explained how we can still do X, Y, Z but couldn't cope with this.
Yet loads of posters being like well why can't he? if he can't do this how come he can do that, how can he cope with being a father? How can he cope with travel? Why didn't you boot him out? Why are you him infantising him ?
For all the talk of empathy, there seems to be a shocking lack of it on here, just because you can't imagine something, doesn't mean the person with the condition is lying about it.
The whole why doesn't he get a grip vibe is awful.
I wasn't going to go into detail about how I wouldn't cope, as I can only talk for myself not op dh or anyone else with autism and also I didn't see why any of us should have to justify how we can do somethings but not others, but maybe if it helps broaden some people's minds then...
So I've travelled all over (although not anymore), work, but as I've said couldn't cope with anyone here at such short notice and also a stranger too me, as my home is my sanctuary (or if I was travelling it would be my hotel room rather then home) it's where at the end of a day ''masking" to look "normal" I can come and destress, unwind and finally be myself rather then trying to act NT and I need that, I really need that, as it's draining pretending to be something else all day, so to have some invade with so little notice that means I can't relax after masking all day or mentally prepare myself for them coming, think of it like a fizzy pop bottle it's been shook all day, rather then relieving the pressure it's just going to get shook again. So the last time someone unexpected came over, I told my dh to say I was working so couldn't come downstairs, I hid under a blanket rocking backwards and forwards for hours I eventually managed to crawl to the toilet, where I had a complete meltdown as the emotional stress was just too much, sobbed, self harmed and beat myself up, before finally lying still again for hours praying the person would leave soon. I couldn't cope and still can't with that situation, doesn't mean I can't do other things though, just means I can't cope in this situation.
I'm not doing that for the shit and giggles, it's involuntary, it's the way my brain is wired, if I could stop it don't you think I would? This whole omg just cope, don't you think if we could do that we would try that!! Autism isn't a light switch that you get to turn off when your sick of it, or when someone tells you to get a grip.
This is a ridiculously long post but I hope the sharing of that story will help people see ( you know what I don't even know what I hope it makes you see, that it's real? Understand? ) and just to point out this is only my story I'm not claiming to speak on behalf of all autistic people, about how they react, if you've met one autistic person, you have met one autistic person.
Also like others who have posted while I've been writing out this mega post, while its fun to play blame the autistic dh I somehow doubt that all these people saying what they would do, would actually house a homeless basically stranger. But let's not dwell on that, onwards with the autism bashing! I await more lovely posts about how op dh is a crap parent or how he should be kicked out of his home for the night or ponderings on how he manages a job 🙃