DEAR MISS MANNERS: I sometimes find myself at an event where no one wants to talk to me. My husband is a scientist, and at his conferences and other work events, the other guests are usually only interested in talking to fellow scientists in their field. I was once sitting at a table in a bar, and the woman sitting next to me turned in her chair so that her back was to me and her front was to the person on the other side. I understand that these people may have traveled a considerable distance, and just want to gossip with their colleagues. But what can I do? I feel uncomfortable sitting by my…