The City of Bend may regulate sidewalk displays downtown.   A group that represents businesses in downtown Bend says its time to regulate the racks and tables that often pop up during the summer months.  The Downtown Bend Business Association wants to keep the area visually pleasing for tourists and free of sidewalk clutter that could get in the way of people with disabilities.  The City Council is expected to vote on July 18 on an ordinance that would create new sidewalk merchandise rules.