In the summer of 2016, the Orange County Vector Control Department posted signs near the parking lot of Cedar Grove Park advising people that mosquitoes carrying West Nile virus have been discovered in Tustin and Orange in 2015. Click here to visit Vector Controls West Nile page.
If you would like to learn more about bug spray and sunscreen usage at the same time, we did find an interesting article in a 7/29/16 posting on the Consumer Reports website.
Many bug sprays and lotions are available including products that last 5 or more hours. You could apply these right before your child is dropped off for Twilight Camp and they would protect your child till the 8:00pm pick up time.