How much concert will I miss if I get there around 9:30 😭😭

Hubby and I have tickets for Friday’s concert at SoFi and my high school senior just let me know they’re doing something special for the seniors at her high school football games halftime show (approx 8:30 pm). Trying to see what time his concerts have started if it’s worth going in late or selling our tickets completely…I had been looking forward to this all year but I can’t miss this.