Since NCTxyear release albums

well the fanchant in black on black mention all the members... if the song allowed nctzen to chant then there will be

I can't imagine how much nctzens would pay for a full member fansign! They're one of the richest fandoms I know so I'm sure SM would make $$$

i remember during SJ's time, even when they had as few as 6 members promoting (during Black Suit era) they used to have different teams of members for each fansign so there is practically no way SM is going to stuff all 21 active NCT members into one closed space for a fansign.