Hold on to your folding chairs — the city was right to ban those and other items left to hold parking spaces after last weekend’s snowstorm. When there’s a massive storm, followed by a Herculean shoveling effort, it might make sense for city officials to look the other way at the timeworn tradition of reserving parking spaces for those who do the heavy work of clearing them out. For years, City Hall has tolerated the folding chairs, traffic cones, toilets, and other household appliances that turn up in streets after snowstorms. In a debate this fall, Mayor-elect Marty Walsh suggested he’d do the same. But for this wink-nod logic to work, a storm has to be big enough. Last weekend’s mild snowfall wasn’t. Shoveling out a space is always a nuisance, and Sunday night was wicked cold. But save those special parking-space rules for a truly snowy day.