The Coronation of Poppea by Claudio Monteverdi, sung in English with Baroque ensemble at Opera Vivente, meeting hall of Emmanuel Episcopal Church, Mar. 6, 8, 12, 14
La traviata by Giuseppe Verdi. Peabody Opera, Friedberg Hall of Peabody Conservatory with Peabody Concert Orchestra, Mar. 11-14. In this production, Violetta is sung by three different sopranos to match Verdi's varied writing for this role.
Don Giovanni by W. A. Mozart. Baltimore Concert Opera at the Engineers Club in concert performance with piano accompaniment, Mar. 25.
All of these performances are in Baltimore's Mount Vernon cultural district. Based on my experience (even if Baltimore Concert is a new company), I recommend buying tickets in advance.