Welcome event not expected in Götterdämmerung? (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Definition and cryptic definition – ‘welcome evenet not expected’ and ‘in Götterdämmerung’. Götterdämmerung or ‘Twilight of the Gods’ is the title of the final part of Wagner’s Ring Cycle, in which all the gods are finally destroyed