Hi Lizzie
We do try to add as many dates in those periods as we can, as we know quite a few of our customers do want to travel at those times. It's more difficult to create a holiday at these times because families are all travelling too, so flight and hotel prices are higher and fewer rooms are available.
I expect that Golden West date was dropped because it wasn't popular last year or because prices for flights or hotels had risen and made it too expensive.
If you haven't done so already, you can use the website to search by date. The homepage allows you to enter your date range, e.g. 1 July to 1 September, and search. This might show you a couple of dates you have missed.
Kind regards
Olly, your editor