Depends how you define 'new'. For over 25 years until COVID a friend and I had a March outing for 72 or 90 holes based around one of our premier UK venues, including Portrush, and we always used to try to get the 'shoulder rate' after the clocks had changed but still with the winter green fees. We never ever encountered a 'no visitors' policy - in fact the opposite. It was much easier to get on to Muirfield or RStG then than later in the year, and much cheaper too...I would be very sad if that option has disappeared.