I like your attempt at the English concept of "When and where will the third conference be?" >ghorgh nuqDaq qaS qep'a'na' wejDich? But, I think the Klingon way of saying this might be: ghorgh qaS qep'a' wejDIch 'ej nuqDaq 'oH using two sentences connected by <'ej>. Qapla' peHruS