A tricky solve, but the central column and the alternating letters of the bottom row direct me to a classic image. But then I'm a bit stuck. i can trace one relevant time span in the left-hand half of the grid (the mirror-image cells in the right-hand half give me NINE MORE T(D), which means nothing to me. I can't see the parties involved. Any suggestions?
This week, as rather often recently, the EV is more of a challenge than the Listener.