You will be fine with Tuesday baking for a Saturday event. Although I try to be within 24 hours from baking to delivery on most orders, if I have to ship cookies, I often need to bake Monday for Tuesday shipping, Friday delivery and Saturday event. Everyone says they travel well and are still delicious. I have experimented at home and found that I really can hardly tell a difference on day 5 from day 1 if they are stored well. And, I'm used to having them straight out of the oven!
The only part of cookies left 5+ days I don't like is that the glace starts to harden. Otherwise, I think NFSC iced and wrapped, when stored tightly, will last at least a week with very good freshness. I tell my clients no more than 2 weeks, but I know they won't make anyone sick after that, they just won't be as delicious.