MAY 19th: Massachusetts Phase-1 COVID-19 Reopening Documents and Postings for Businesses to follow. Phase 1 Massachusetts Reopening : Employer Guidance: Mandatory safety standards for the workplace. Phase 1 Massachusetts Reopening : Employee Guidance: Mandatory safety standards for the workplace poster. Phase 1 Massachusetts Reopening : COVID-19 Control Plan Template Display Poster for business owners to post at their business. Phase 1 Massachusetts Reopening : COVID-19 Control plan template for businesses.