Implementere event fra interface

Hvordan implementerer jeg min event fra mit interface?

-----------Interface.cs----------
public delegate void SyncEnd(object sender, EventArgs e);

public interface ISyncronizer{
  void Start();
  event SyncEnd OnEnd;
}

----------Implement.cs------------
class test : ISyncronizer
  public delegate void SyncEnd(object sender, EventArgs e);
  public event SyncStart OnStart;
  public event SyncEnd OnEnd;

  //giver compilerfejl CS0536
}