It's not RadioDupree but WUSB serving up the annual Zappathon.
Hosted by Nigey Lennon it commences at noon EST. (That's 6 in the evening Central European Time). Or maybe 1 pm EST/7 PM CET. WUSB and Nigey have different info on their pages. I'd tune in at noon/6 just to be on the safe side!
She promises lots of FZ music plus guests like Greg Russo (who wrote the reference work Cosmic Debris), Candy Zappa and Rabbi Joe (of Armadillo World Headquarters).
Just thought you might like to know...