The missing invitation card

The President’s birthday party was supposed to start at seven o’clock at the Grand Marriott Hotel. In the morning I thought of checking to make sure that I had my invitation card. Alas, some hostile forces attacked. I could not find my invitation! I knew where I had placed it, but I could not find it on the table. I searched for it everywhere, but all in vain. I was afraid that I would not be allowed to go to the dinner.