Hmmm.....
If Bilbo would try anything from "Why don't you come over for some tea?" to "Let's get this 111th birthday party started!!!!"
So would Frodo mind you.
Gandalf, well he could just uncloak couldn't he??? I did not just do that!!! Oops!!!! I meant he would "He, now that I'm not Gandalf the Grey, do you want to go out with me?"
I honestly don't know how Mandos managed to get anyone but I imagine it was something like this... "Hey!! Want to come over to my cool bachelor pad that's
NOT filled with dead people?"