How often did you check if your favorite store is available or not? That's exactly what your clients will do. Don't post to hasty (wait for what the authorities oblige you to do before saying somthing contrary) but dont wait too long - every minute counts for sales.
Do you have webshop? Maybe even just for vouchers? Then tell your clients! If you don't have one, think about setting one up (even if it is just for vouchers). More tips about that in the next post.
Don't forget those (obvious) channels:
Do you know any good immediate measures? Share them in the comments! Let us gather and make us own the moment instead of suffering from it.