[Sir_Cmpwn]

>Taking a photo to commemorate a once-in-a-lifetime experience, recording video to show friends

Not okay at the expense of others. Professional photographers and videographers are likely recording the event for you.

>checking the time because you can't stay until the very end

Plan better or buy a watch

>checking the babysitter hasn't called to say the kids are in hospital

What are you going to do other than worry if you go to the hospital? What do you think people did before cell phones? It's OKAY to disconnect for a bit.