If there isn't a wait associated with your PS, yes, but if there is, then there is no hope. I've eaten at Le Cellier twice, once I was seated promptly, the second time I had to wait 40 minutes even with a PS. Le Cellier, is a very small place and it can get crowded even with PS's. I would say that if your night will be ruined by not seeing the parade, I'd move your PS up, if you really don't care, then leave it as is.