If you don't already have one, it's time to start an Entertaining Binder. Use a 3-ring binder to organize all the entertaining ideas that you learn about. You can print out pages from Suite 101 or the internet, or you can tear out magazine articles and pictures that interest you.
Organize the binder in whatever manner makes the most sense to you (recipes, decorations, theme ideas, holidays, etc). When you plan your next get-together, you'll have a wealth of ideas to draw from!