Teishu sends Invitation to the guests one month before the date of the chaji. The guests should confirm whether they will attend or not as soon as possible. The day before the chaji the Shokyaku should visit the host. He will not enter the house, just greet the teishu from the outside. This was to make sure that the shoukyaku knew how to find the house, and to make sure that there was no unforeseen things in the neighbourhood. Also this would be the time to give teishu Orei.