If you have a marketing season coming up, start a countdown leading up to it
Your POS software allows you to put notes on, so you put on 12 days, 11 days, 10 days, etc.
If you have a Facebook page or email marketing, you can take advantage of social media marketing for free too to begin counting down the days until whatever holiday it is you are leading up to. As you connect with your customers share daily updates regarding how many days are left for this upcoming holiday. You will be surprised how many of them intend to do something and forget.
The idea is to keep things rolling.