A few days before the party I called the parents of the childern that were coming to the party. I asked them what present they bought for my daughter.  I made little bingo cards with the names of the presents in the blocks. ( one present for each block) I handed out bingo dobbers.  As the presents were being opened the kids would put a mark on the block that had the present that was opened. (just like Bingo,just with words) It kept the kids entertained and gave my daughter a lot more room to open her gifts.