The start of Southern California’s longest and biggest heat wave of the year arrives Wednesday, which means high school sports programs are in preparation mode to protect their athletes while continuing to hold or modify events. In the Los Angeles Unified School District, it will be up to school administrators to make decisions on events and practices while consulting with district personnel, but everyone will be checking the heat index (how it really feels when relative humidity is factored with the air temperature) and receiving information from the Office of Environmental Health and Safety. Some events have been canceled, such as a cross-country meet scheduled for Pierce College in Woodland…