In some prophetic traditions it has been reported that the verse of ‘sura baqara’ is good for protection from Satan and evil spirits. Therefore, a person should recite these verses three times out loud three days in a row and hope that whatever evil spirits where there would be gone. To have a new home is a big bounty, and people invite others to celebrate, it is okay to have such gatherings. But this should not be in the form official ceremony.