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Most courts are going to want you to appear in person in this type of case. You have the option of calling the court to find out if you can plead guilty/pay the fine over the phone, but it is up to them if they allow you to do that or not. The only other option is to find an attorney in MD to appear on your behalf. As you can imagine, the attorney's fee may be more expensive than the tickets themselves.
Because you were given new trial dates, I believe you are going to have to appear.