Perhaps you remember that in the days B.Z. (before Zuckerberg), if someone wanted to invite you somewhere — be it a birthday party or their band's CD release show — they would send you an "eVite," an e-mail that directed you to a quaint little RSVP site where you could reply yes, no or maybe, perhaps leave a brief message and go about your day. Some people still use this system, which has turned out to be a smart move. Facebook invitations are easy to ignore and ultimately misleading — one informal calculus says that only about one in ten people who replies "yes" will actually bother to show up. Since eVites work from a mailing list, they're specifically targeted to people who have already expressed an interest in something, such as the monthly acoustic concert series Heights Live! at Heights Presbyterian Church. Every few weeks, another eVite shows up inviting us to an intimate evening with some of the top local and regional talent around, such as Austin harmonizers The Trishas or the Honky Tonk Blood crew of John Evans, Hank Schyma and Johnny Falstaff. Quick, easy and painless. By the way, Heights Live! also has a Facebook page. They're not complete Luddites.