CONCORD — New Hampshire is offering a third COVID-19 mass vaccination event at New Hampshire Motor Speedway in Loudon with the one-shot Johnson & Johnson vaccine. Gov. Chris Sununu announced the Saturday and Sunday, April 10-11 event, which is by appointment only at vaccines.nh.gov using the state's Vaccine & Immunization Network Interface, known as VINI. The state hopes to vaccinate 12,000 individuals at the speedway this weekend with doses being administered 8 a.m.-4:30 p.m. both days. Prior to release to the general public, the state alerted by text and email notification those individuals who earlier qualified due to medical vulnerabilities or who are 50-plus and have not yet scheduled an appointment, or currently have an appointment scheduled in late April or beyond.