Here the demand for these dates comes from two things... all the high end venues get booked for the prime dates 2 yrs in advance... and lower price for Friday and Sunday's is very motivating when you're talking abotu $400 per person for a Saturday vs $250 per person for a Sunday and a 150 person minimum.
It makes sense in a densely populated area that venues would book out on their dates. It also strikes me at the price per person in your area versus here. I'm doubtful that any Birmingham venues are getting $400 per person, much less my little venue out in the country. My of my top-end packages are coming in at $100 per person, and that includes food, cake, DJ and coordinator.
On showing prices on my website, I'm still waffling over that one. Showing complete package pricing has been something I've been doing for 17 years now. It's been a staple of how I pitched my services and it's hard to switch mentality, but I'm going to try it.