ORNMENT EXCHANGE PARTY? I NEED TO KNOW ABOUT WHEN DA FIRST PERSON PICK AN ORNAMENT HOW WILL THEY EXCHANGE?

I LOOKED @ WEBLINKS 4 AN ANSWER...OK WHEN WE PICK NUMBERS & #1 PICKS FIRST OF COURSE HOW CAN #1 EXCHANGE THERE ORNAMENT? IF THERE DA ONLY ONE WHO PICKED & WANTS 2 EXCHANGE IT. DO WE WAIT TIL DA END???? HELP!!!!!! PARTY IS 2MORROW GOING CAZY!!!!! ANY ANSWERS ARE WECOME & HOPING WILL HELP! THANKS.