The continuing budget impasse in Richmond is leading some schools to adopt a school calendar for the coming year without knowing for sure if they’ll be allowed to open before Labor Day. It’s all part of the complicated system of permanent and temporary waivers some school systems have to begin classes before September. But most waivers are included as part of the budget, and right now, there is still no budget approval — and no waiver yet. WFIR’s Evan Jones has the story.