In detail, what were you charged with? Additionally, is the State of Maryland prosecuting this, or is it Federal? You mentioned the DEA was involved, this would indicate to me that it's Federal. Cannabis is still illegal in all 50 states under Federal law. What deals has the prosecutor offered you, are you in drug court?

You need to show up for your court dates. If you don't the judge will issue a warrant and you will probably forfeit your bond, they can also revoke your bail. They can even charge you with failure to appear, which can get you up to an additional two years in prison. You also risk pissing off your attorney and having them drop you as a client.