According to the OP the Statue of Shiva is located between buildings 39 and 40.
The statue is on permanent display in the square between buildings 39 and 40, a short distance from the Main Building.
https://cds.cern.ch/record/745737?ln=de
Looking at various photographs this appears to be true. Building 39 is a hostel. So are 41 and 38.
From the CERN Housing Service page:

http://smb-dep.web.cern.ch/en/CERN_Housing
This places the ritual near where people visiting for all the reasons people visit CERN would be staying. Another DATA point that perhaps suggests a prank as that is where the young people on campus would be housed. That's not the only way to see that I suppose.
Evangelical Christians have taken an interest in CERN, well before this apparent mock human sacrifice. Opening the gates of hell and all. Trying to suss the origins of the universe from some source other than the Holy Bible. Eeevil scientists. Might that explain the choice of this prank? Freak all the nutty christians out?
This woman is from Tennessee, the American South. Very polite.
Does anyone else feel like the person recording the video of the ritual is likely an American?