Today our lives have become filled with many acronyms — like POTUS for president of the United States and FBI for Federal Bureau of Investigation and IRS for — well, you get the idea.Well, more are coming, so get used to it. One that has reemerged in popular use these days is TBA — “to be announced” — due to uncertainty of sports or theatrical events caused by the pandemic.Here are some applications of TBA from local theaters:From Goodman Theatre: Artistic Director Robert Falls and …