LOL !

I never knew 12:06 AM was still considered 9th June. You missed by 6 minutes !

Nice puzzle !!
The four 2-letter additions are :
SUE + DE = SUEDE
GAZE + BO = GAZEBO
ARE + NA = ARENA
MEMO + IR = MEMOIR

So, the 8-lettered word is : DE + BO + NA + IR = DEBONAIR