I posted two possible versions for invitations that you could use and used your party information as an example. I'm hoping the things I made match what you had invisioned.
I posted a picture of a cute "favor/loot bag" that works with a western theme...
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Since you are having a week long event...you should invite everyone to one of the campfire sing alongs. I posted an example pic of a smore packet that you could take and distribute to the guests. You could use one of the bandana bag toppers to make your own. You could also make the water bottles with the bandana wrappers, as you always need a little something to drink after a smore!
I believe there are several campfire sing alongs at different Disney locations...here is one:
There is a free Campfire Sing-Along with Chip & Dale at the WDW Fort Wilderness Campground. It generally begins around 7 p.m. during the fall/winter season and 8 p.m. beginning sometime in April through the summer. It is held near the Meadow Trading Post in the campfire area. The program begins with a sing-along led by a Disney cast member - if you've seen "Barney", you know these songs - and a marshmallow roast around two campfire rings. While this is going on, Chip and Dale make an appearance to visit with guests and sign autographs. The sing-along lasts about 40 minutes.
After the sing-along , aDisney movie is shown on a large outdoor screen.Seating is available in bleachers or on benches. There is also plenty of room to lay out a blanket or set up your own camp chairs. We try to post all of the resort movie schedules on our website at the beginning of the month. The current movie schedule is posted at all comfort stations. In the event of rain, the sing-along is still held on the porch of the Meadow Trading Post.
You may bring your own marshmallows or buy them at the Chuckwagon Snack Bar (roasting sticks - $0.49 each, Marshmallow Bag -$3.99, Hershey's Chocolate Bars - $1.99 each, or a whole s'mores kit is around $8.99; prices accurate as of May 2010). You may also buy pizza, hot dogs, candy, nachos, juice, popcorn, sodas, coffee, beer and other refreshments at the Chuckwagon Snack Bar.
The campground also has a free petting zoo and pony rides (about $5 each) that close earlier in the afternoon. These are in the "Settlement Trading Post" area - take the Ft. Wilderness internal bus. The Trail's End Restaurant is considered one of WDW's best buffet values. The Trail's End also has a carry-out window called “Trails-To-Go” 16-inch pizzas and fried chicken meals – both individually sized and family sized. If you have a free day (or your arrival day), you can go early and see the petting zoo, have a nice dinner, and then head over to the Sing-Along.
We recommend this to every one going to Disneyworld with young kids because we enjoy it so much. It is one of Disney's least expensive Character Meet and Greet experiences and a great low-key activity when you find yourself a little over-stimulated from the theme parks.