Tis the season for announcements of radio-sponsored festivals. Namely, the Cities 97-sponsored Basilica Block Party (July 9-10 at the Basilica of St. Mary) and the Current-affiliated Rock the Garden (June 19 at Walker Art Center). The Basilica lineup will be announced Wednesday afternoon on Cities 97. Mary Lucia will disclose the Rock the Garden talent at 4 p.m. April 13 from Brit's pub, where she will be broadcasting live on 89.3 the Current. No inside word on who is booked for these popular events. But let's do a little speculating, based on current tour schedules and relationships these stations have with various acts. So here are some guesses: For Rock the Garden, let's speculate that MGMT and Free Energy will be involved. For Basilica Block Party, let's guess Brandi Carlile, Train, Colbie Caillat and Eric Hutchinson. And which of the two events might land the Avett Brothers or Sharon Jones & the Dap-Kings? If these guesses are right, we told you so. If they're incorrect, well, just think of it as more speculation in the blogosphere. Who would you like to see at this year's Basilica and Rock the Garden?