Yeah, you know what, perhaps you are being a little U, but no more U than I would be in the same circumstances.
Yes, even with a capable, normal dad I would worry about my 2yo going away from me.
Yes, the plane thing would worry me too, but that is normal also, we are mums, worrying is what we do! 
I totally get you about the him not getting the full benefit of being YOU for the 3 days when you need to go off. I do totally get you feeling somewhat miffed that he seeming has a get out from seeing what you have to do all day every day.
so, as I say, yeah you may be being U, but you are only writing down what many, many, many of us would think in the same circumstances.
Let him go off, it'll be great, cos you will be able to devote all your energy to your project and he will have to just get on with it. I hope it goes well, and I also hope that it does give him an appreciation of what you do.
Don't get hung up on what they do, eat, when they sleep etc, that is all down to him that weekend, she is 2, even if they feed her chocolat and escargot the entire trip, she will be fine!