If you travel solo you can't.
At times solos seem to be treated like step children. At Tusker House one time I got my food, wandered around for several minutes until I spotted a group getting up. The table was for six people, but was the only table available. I had just sat down and started spreading my stuff out, when a lady approached and basically demanded I give her the table, as she had a family of six coming and since I was solo I should find another table. I looked around at all the full tables and told her they were welcome to join me, but I wasn't moving. No way was I going outside as hot as it was. She got huffy and stomped off and the elderly couple behind her (also looking for a table) said that if I didn't mind, they'd take me up on that offer. I got to meet a very nice couple from Simsbury, CT.
Anyway my point is, if the only table available is one for larger groups, would you consider it rude for a solo to sit there?