Solarize Brookline, a group promoting the use of more solar energy in local homes and businesses, will hold an informational session Thursday at 8:30 p.m in Town Hall. Representatives from Solar Flair Energy Inc., chosen as the contractor for the town’s Solarize Massachusetts program, will discuss installing residential solar photovoltaic energy systems. Brookline was one of 10 towns selected by the Massachusetts Clean Energy Center and the state’s Department of Energy Resources to participate in the first round of this year’s Solarize Massachusetts effort. Under the program, the more residents and businesses that sign up to have solar panels installed, the less the work will cost. Brookline’s group is also joining forces with its counterpart in Newton to host a workshop on Aug. 29 at 8 p.m. in Boston College’s Gasson Hall. The program will discuss energy-efficiency improvements, and launch a friendly competition between the neighboring communities to see which can make the most of the environmentally friendly opportunities.