Where is the parking for this place ?

Here is a website with parking options at and around the Civic: https://pasadenacenter.visitpasadena.com/parking/ There are 600 spaces onsite (entrance on Marengo Avenue) and alternative parking lots surrounding the auditorium.

Sheraton parking

There are a few parking structures there, one is the Sheraton parking which is the closest and has a direct passage to one of the buildings of the Convention Ctr and Sherston.It is just behind the skating rink by Euclid. Another is on the corner of Euclid and green right across the paseo. The third is the one in Cordova which is a block to walk and another one is at the corner of green and Marengo.

Onsite parking was the best option for graduation