Where can you find AD hoc party for monster hunter freedom unite

load your characters
as you enter the gathering hall, press "o" not "[ ]".
"O" online game (which uses the adhoc)
"[ ]" offline game (which is a 1 player gathering hall.
your psp will enter 2 different way when you press "O", Automatic and Manual
Manual = a list of gathering halls (gathering hall 1 - gathering hall 20) will be seen then you can choose from there what gathering hall you want to enter (max 4 hunters per gathering hall).

Automatic = the list will not be seen and you automatically go to gathering hall 1 regardless if it's full or not.

you change to automatic or manual by pressing the "start" then change it under the options menu (press left/right if you don't seethe "options" menu)