Look at your target customer base. Suitable for general weddings, annual meetings, small gatherings, etc. , just buy 30-60 square meters. Large-scale party, with a screen of about 120 square meters. Such as large-scale concerts and product launches. Get about 300~400 screens, most of them are several friends to buy the same batch of products, small activities are done separately, and large activities are done together to avoid color difference when buying the same batch together.