I mainly stay home - but sometimes we are out for dinner or whatever, and I just try and do a rough version of their routine while out - we give them dinner at their normal time, then do bath etc and THEN go out - usually at least one of them is asleep by the time we get there anyway, so then I just do what needs to be done - and socialise when I can!
They are both pretty good with doing this - and I think thats because even though we aren't at home, they know what to expect.

There have been times when we've had guests over and Ive had to disappear for a while - but so be it!