I'm a little embarrassed to admit how many times I went to the Time Out Market when I was in Lisbon for a month. So I won't. But needless to say it was a lot and I never ran out of new things to try. Having so much food from many well-known Lisbon chefs in one place made me feel like a kid in a candy store. It can be pretty tough to find a seat during peak times (read "lunch and dinner")! Keep wandering and you'll find one eventually. Don't be shy about sitting next to or across from a stranger.