For 51 years, New Canaan has held its Sidewalk Sale & Village Fair in July. With the third week of the month already underway, New Canaan stores and shops have already started to set up for this weekend. Although the town has had this date set for every year, the Darien and Greenwich weekend sales fall on the same days this year. Expected to lose some of the crowd to the other towns, the New Canaan Chamber of Commerce has worked with stores and town officials that many expect will please bargain-hunters and merchants alike this year. For the first time, street-level stores downtown will hold ‘Early Bird Sales’ on Friday.