There are innumerable reasons you might need a custom banner or signal, when you'll, and you also never know. Here are four functions for which you might:
A Grand-Opening: Boost it well, and you need to encourage it in the event that you are starting a store or shop of any sort. The very first few months for just about any company are critical, and just the impetus you have to get through them can be generated by an opening that is great. Advertise anywhere and every where you can, and with whatever you can: business cards, outside banners, nylon flags, magnetic signs, car wraps, you name it.
Going Out of Business Sale: You need to advertise just as much in the event you are having a going out of business sale. This is your last chance to earn a profit on your own investment, so bust out banners and the flags and window images to let people know about your going out-of-business sale. Again, market wherever you can -- you need as many clients as possible as of this sale that is final.
Special In Store Promotions: You don't necessarily need to have a sale to get folks in your store. According to the kind of company you run, make an effort to get a star -- or else or neighborhood -- to do a meet-and-greet or signing of some sort. Say you have a book store -- get out an author using a new publication to do a reading. Or, should you operate at a sports goods store, research getting a well-known athlete from the area to sign autographs for an afternoon.
Any Ongoing Promotions: You may have occasions or special prices once weekly, once per month, perhaps even once annually. Alternatively, you might have a sign so you could record on the day and date, made up with a clean spot.
Regardless of the occasion, make sure you employ the Web as well as any signage that is bodily you use. That's what it's there for -- to spread the word about, well, everything. Twitter use Facebook, MySpace, a Linked In, everything and whatever you can. Set up an Yelp accounts so people can afterwards write critiques of whatever you're planning, and ensure you're on FourSquare so individuals can "register" when they visit your store. Custom banners and signs are great for receiving out the initial word there, but you need follow up info that individuals can conserve on their computers or telephones.