Is the court appearance you're referring to the appearance for the traffic tickets? the first appearance is the arraingment and usually offers a chance to meet with prosecutor (if City) or Assistant DA (if county) and find out what offer they are making. Missing court appearances is not a smart choice especially since it will result in a warrant being issued (which can result in your being arrested at your work place) and a further suspension of your license. You can hire an attorney to go to court for you to traffic court. It is well worth the money if it keeps you from getting fired.
Your concern in not so much with the tickets as with any violation of probation, which can also result in a warrant being issued and you facing possible jail. Needless to say, hiring a local attorney is a must.
All violations, however technical in nature, can subject you to facing a restructured sentence under the guidelines of the original charge as all violations equally violate the sentence.
If the determination is made the defendant violated the sentence, this is where differences in violations come into play. For instance, commission of the same crime again is treated more harshly than say, missing a night of curfew. This is a generalization but it is a good one. Everyone should note that there is no set guideline in the law about the value of any given violation.
It is the overall exposure which makes me urge people to seek counsel for violations. It should be treated as carefully if not more than the original charges in court. You have the very right to counsel at the violation hearing and sentencing you did prior to trial or plea on the case, and you should take advantage of this right.