Event preview before tickets are available for purchase

I have an events community and one of the advantage of being a member is that you get a sneak peak at upcoming events before ticket sales open the following day. At the moment, the only way I can display events for members without them starting to purchase is to duplicate my event and make one ticket sellable at a price of £9999.99, along with a not very slick message requesting that nobody purchase as the listing is a preview listing. Despite this, a member still almost purchased the ticket this morning due to not concentrating and noting the price - luckily her card declined. It would be great to be able to make a preview event visible or publish an event without any available tickets to purchase.