1) Twelfth Night by William Shakespeare Theatre@First opens its performance of "Twelfth Night" tonight at 8 p.m. at Unity Somerville, 6 William St. There will also be performances on Sept. 20, 21, 26, 27 and 28.
2) Land Use Committee The Somerville Board of Aldermen's Land Use Committee meets tonight to discuss a number of important issues, including a proposed moratorium on medical marijuana facilities, supermarket zoning, and affordable housing linkage fees. There will also be public hearings on zoning amendments that would affect Union Square, Winter Hill and the area near Cambridge's North Point. There are technically two meetings scheduled. The hearings are at 6 p.m., and the other issues will be discussed at 6:45 p.m. The meetings take place at City Hall.
4) Somerville Adult Evening School Registration Registration takes place tonight from 6 p.m. to 8 p.m. at the Somerville High School main office, 81 Highland Ave. You can also contact Sophia Carafotes, the principal, at (617) 628-2594, or you can register online at somerville.k12.ma.us/eveningschool.