I attended a baby shower over the weekend and while the hostess committed only one etiquette error the guests were something else. I thought it might be interesting to compile a list of 'rules' to address this situation. Add on as you see fit.
1. If your children are 'helping' with the gift opening, supervise them. Tell them to sit down in an out of the way spot (not immediately in front of the HC/PTB), hand the gifts one at a time, don't fight over which gift goes next or who gets to hand it over & don't mix up the cards & gifts.
2. When the HC/PTB are opening gifts, keep your conversation (if you must have one) to a whisper. Don't talk so loud you make it impossible for the other guests to hear anything the HC/PTB says and then keep calling out, "Who gave you that one?"
3. Don't stand and start walking around the room to take photos of the other guests, HC/PTB during the gift opening, blocking the view of the guests. Everyone likes to see their own gift get opened and acknowledged.