Sunday also would have been graduation day for 17-year-old Jennie Dizon.
She was a senior at Benet Academy in Lisle where the event took place.
Several of her classmates wore ribbons in her honor and some wrote her name on their caps.
for," said Lindsay Tocik.
"She was just awesome and I'm sad she's not here," said Louisa Pavlik.
The students said Jennie's parents were at the graduation to receive their daughter's diploma.
Dizon was in O'Brien Park in the western suburb when she was killed late in the afternoon.
An autopsy confirmed she died of electrocution by lightning strike.