If you are invited to an author's luncheon as guest author and you find your table because of your name perched on a display holder, Do not remove the sign. Even it it gets in the way of people seeing who you are and you seeing other people.
I once sat at 'my' table at a conference and removed the sign so that I could talk to everyone -- and everyone assumed I was a rude conference goer taking the author's place. (but they didn't say anything, just were a little cold to me.)
It wasn't until the end of the luncheon (after I had had nice conversations with the people from either side of me) and the head table read our names and asked us to stand up, that the table realized that they really did have an author at their table. hmmmm.
I still did the 'whose birthday is closest to mine" contest to determine the winner of the books I had brought as table gifts.
Which reminds me - one time they asked us to put our gift books on display on the table. As soon as I did, four people left the table. (one was a halloween book and the others had people of color on the cover) After our shock, I simply told the remaining three people that it looked as if they each got one of my books. (lemonade out of lemons.)