For the second part, ChatGPT only could potentially aggregated options but It will not get quotes, booking etc, it will stay shallow. The value here is that it gives you good venues vetted by our network but you can also book them and continue organizing your event with process and credibility of a real company.
A retreat is $$$ expensive, you need a real company in the background to insure the booking and finance safety, ChatGPT won't do that.