Huge extravaganzas, blockbuster affaires, five-star entertaining…who has the energy or disposable income these days to plan over-the-top parties anymore? And, really, it’s just not necessary if what you care about is bringing friends and family together to celebrate or mark a special occasion. As someone who has done her fair share of events for work and pleasure, my most successful endeavors come from summoning up a little creative MOJO, some DIY spirit, and keeping it simple. Pick an Un-Themed Theme Rather than pick something standard or choose the latest, popular character theme, try to brainstorm a bit about the guests of honor and the people who will be attending. Think…