The hearing are usually suppression hearings where the court decides whether or not certain evidence is admissible or not. Depending on how busy the court is and everyone's schedule it's possible that the. Ate goes directly to trial right after the hearings. Talk to your lawyer.
District Attorneys rarely drop cases that have gone as far as a hearing and next going to trial. Once in extremely blue moon, I guess it happens. Sort of like a total eclipse of the sun, very rare,
Sometimes the DA is more concerned about the complainant than the merits or demerits of the case itself.
Hearings usually only last a few hours and then it's on to trial, either directly or after a brief adjournment.
In NY County a suppression hearing could be held the same day as the start of a trial or they could be many months apart. At the hearing, the prosecution will put one or more witnesses on the stand. The defense can present witnesses, but usually does not. The DA will drop charges only if crucial and necessary evidence is supressed.