The U.S. Army Corps of Engineers is reviewing whether to again allow the collegiate rowing championship at the Lake Lanier Olympic Venue, something Gainesville officials worry will end the event that generates millions in economic activity. “This is a huge event,” Mayor Danny Dunagan said of the American Collegiate Rowing Association national championship that’s been held every Memorial Day weekend for the past five years. “Hopefully, everything’s going to be OK.” The corps has long had a policy of restricting major events on the lake during holiday weekends, though some exceptions and permits are granted.