MILWAUKEE A big birthday party for Miller Brewing is about to get underway today.The nation's second-largest and oldest major brewer is having a 150th anniversary bash with about 35-thousand people expected to attend by invitation only.It's called the Big Brew-Ha. The tailgate gets underway early this afternoon at Miller Park.Then the crowds will come inside for musical acts like the Goo Goo Dolls and Bon Jovi -- and of course -- Miller beer.About 100 descendants of the Miller family are expected to attend.The family sold the brewery 35 years ago. But Miller Family Reunion coordinator Tim John