"Unannounced guests" refers to people who visit or arrive at a place without any prior notification or invitation.
Full definition
It always meant that my grandmother's house would be decorated to the hilt and treats were always at the ready
for unannounced guests to stop by.
I'd have guests unannounced all the time if I served them this
Some front line companies such as Samsung and Philips along with the biggest electronics retailer in Europe, Media Saturn, had to deal
with unannounced guests from the European Commission.
Sculptures by Robert Gober, Mike Kelley, Bjarne Melgaard, and Haim Steinbach thus appear out of context
like unannounced guests, familiar yet estranged.
Funny post:)-RRB--RRB- Yes I had few of
those unannounced guests..
While in the midst of hunting down their next victim, Dexter and Lumen are surprised by the return of
an unannounced guest; Debra is assigned to the file room, but still manages to uncover new evidence in the Barrel Girl case.
Be it a networking event for work or having
unannounced guests, these kind of interactions can cause even the most outgoing among us to feel unsettled.