What was going on in Los Angeles on Saturday that created so many motorcades?

First, around 2 p.m. I saw a motorcade of police detective cars with their blue and red windshield lights on going east on the Santa Monica Freeway.

Then half an hour later I saw a motorcade of about 20 motorcycle officers going west on the Santa Monica Freeway.

Finally, around 11 p.m. I saw a caravan of buses getting a police escort going south on Highland Avenue at Santa Monica Boulevard. You can see the motorcycle officer had stopped cross traffic to let these VIPS go through the intersection.