Bring the documents they asked for in your oath letter. The ceremony is an hour long program (maybe longer depending on how many are taking oath).There is no interview anymore but you'll need to be present to sign your citizenship certificate. And of course,you'll be expected to take the oath of allegiance (repeat the oath loud and clear) and sing Oh Canada . There's also photo op at the end of the program for your souvenir. ;D ;D ;D