My parents and my sister and brother-in-law are coming into town for the weekend, and they are huge sushi hounds. I would love to take them to Oishii, where I have never been and have always wanted to go, for lunch on Saturday or Sunday. (The entry on boston.com says they open at 1 on Sat-Sun.) I know, though, that a party of 6 would take up most of the seats there. What do you think I would need to do to make sure we get in? Arrive at 12 and sit on the sidewalk? Arrive at 9am and sit on the sidewalk? Or should I just not try to take 6 people there, and go sometime with just my husband?