I disagree with forgetting the PS altogether. That's assuming all the others who made PS's show, and that's a long shot. One time we had the PS time wrong, so we were late, and it was to the sacred CRT breakfast of all places. Even though we were significantly late (at least 30 min.) they were very kind and seated us. When you don't show on time for your PS, others waiting are just going to be seated all the faster. It's possible you won't get your PS and will have to eat elsewhere. It's equally possible others will miss their PS's, and you'll get worked in.