I couldn’t verify a single exact “first day of high school at El Camino” for 2007 from the available information, but one 2007–2008 school calendar shows August 16, 2007 as the first day of school for students.

What I found

  • The calendar source lists August 16, 2007 as “First Day of School for Students”.
  • I also found El Camino school pages, but they did not provide a 2007-specific first-day date for your exact school context.

Important note

“El Camino” can refer to different schools, so this date is the best match from the evidence I could verify, not a guaranteed match for every El Camino high school.

TL;DR: The most likely first day of high school at El Camino in 2007 was August 16, 2007.