Downtown Mesa, which launched a special outdoor dining area called al Fresco off Main last month, begins offering free meal delivery and free live music for those outdoor diners Thursday. Located on MacDonald just north of Main, the half-block fenced area serves as a community ‘‘patio’’ for all downtown restaurants. The city provide tables and chairs, hand sanitizer and wipes, and a cleaning staff throughout the day. Starting Thursday, diners can see menus from a dozen eateries at their tables, place their orders, and pay online by smartphone. A Downtown Dash ‘‘host’’ then will deliver the meal to their table at no additional cost. The delivery service will be available from 11 a.m.-2 p.m. and 4-7:30 p.m. Thursdays, Fridays, and Saturdays (although the dining area is open every day). Also starting Thursday will be live musical acts during lunch and dinner hours.