To reserve a park facility or view what's going on in one of Pasadena's parks:
Go to www.cityofpasadena.net/reserve
Go to "View & Reserve a City Facility or Park Area" and Click on "Reserve"
Click on "View Facilities"
For "Location" select the desired park (e.g. "Central Park") and for "Type of Facility" select "all". This brings you to the calendar for all permits in the named park.