Miss First Two Days of University Orientation or Free Trip To London?

Hi, I am really interested in going to a particular university, but I have recently been offered to go to London for a summer program in my field of interest.

The university orientation is known to be one of the best times of the students lives and is full of traditions. I would be missing 2/7 days of it.

Should I go to the program in London? Will the be any consequences to missing the beginning of orientation or can I arrive fashionably late?

edit I can’t go to London b/c I would miss all of orientation