Cook ears of corn in boiling water, then let cool. Cut corn off of cobs and refrigerate.
Meanwhile, dice other veggies and mix with corn once cooled. Always add avocados last after mixing, and combine gently so they don't get smashed.
Whisk together vinaigrette ingredients. Wait to dress until right before serving. Pour vinaigrette and gently fold it into salsa. Serve as a salsa with tortilla chips, or eat alone as a salad.