I guess the answer is simple: I feel I want to and that it makes sense to me, from within. So I don't even question it, I just do whatever it is needed so I can put it in practice.
Before even starting the project I announce my intention and state it as a mandatory condition for my participation as facilitator of the training. Only then I accept the project. (And yes, sometimes the first reaction of the company is a little bit like 'You are joking, right?!" But once they know how serious I am about it, that is no longer an issue. They even give me tips about a room where I can confortably leave the baby during the training!)
And then I start my planning!
Is this easy? Not at all! (Not for me, at least!) It is extremely tiring and demanding. But is it worth it? Oh YEAH!
The traveling part is the first challenge.
Going alone and not on a vacation mode, I had to pack just the essentials, so I can travel as light as I can but still bring all the professional stuff plus all the basic baby-stuf. The least, the best! (I rely a lot on the help of strangers, everyone gave a small hand and is eager to facilitate our lives, I felt!)
Once the process starts I introduce him to the group and announce his presence along the days.
I noticed that it even helps in the creation of the atmosphere of sharing and going deep, for the group. It says without saying "This is real life. This is not a separated scenario who are only working. We are really seeking the best way to work but keeping our focus on real life and real conditions!"