An important thing to remember is that on the opening day, you need to start thinking in creating a long-term relationship with every person that assist to your opening day. The fact is that long-term and loyal customers is what most times sustains the business. For that, you need to build this relationship. How so? Well, in the opening day you can ask through cards or brochures for certain information like their names and emails.
Once you have this basic information, and the event is done. You can keep contacting them and offering your service any time you want. You will make them interested in what you offer, and they will remember you. Besides, you can create in your customer a sense of loyalty that will be beneficial to your business in the long run.