Staff Nature Center at Irvine Park Staff Nature Center at Irvine Park. Activity Details Date: Saturday, December 31, 2016 Time: 11:30 am - 3:30 pm Duration (hours:minutes): 4:00 Type: Stewardship Organization: OC Parks Area: Irvine Regional Park Staging Area: Irvine Regional Park Difficulty: 1 Minimum Age: 12 Email Activity to Friend Registration is closed for this activity..