Can my son bring a printed photo copy of vaccination card or does it have to be the original card. We don't want him losing his oroginal.

At Walnut Creek, you an bring a copy of your vaccination card

Depends on the venue. You have to contact the venue and find out. Some will except a screenshot on you phone. Most want the actual SIGNED CARD OR NEGATIVE TEST RESULT that you received from your doctor or pharmacist.

Yes it's fine

No one about the vaccine.

My girlfriend was able to show her vax card through a photo on her phone so that should be okay

I believe a copy will be fine

I believe photos of the card are fine