i would definately invite all my freinds....if they are not there by ur side then whats the point? its not like a big secret occasion. i think it should be fun even if its in a small place or house...im sure ur freind will be happy to just be there. its a once in a lifetime thing after all.
Congratulations Munni!!!! :) i am so happy for you!
I would definitely invite friends to a nikaah because that is the "main" deal. We just make up the rukhsati stuff later for our convenience. But really you are getting married in a few months time so I would definitely want my friends to be there :)
if its a nikkah then i would definitely invite my closest friends, its the main event after all!
and i wouldn't worry about having it in a masjid-- usually they hold it in a private room inside the masjid so its just your family and friends. i think i would prefer having it in a masjid but it depends on where you live