public class MyClass
{
    public event EventHandler FirstEvent;
    public event EventHandler SecondEvent;
    public event EventHandler ThirdEvent;

    public void RaiseFirstEvent()
    {
        FirstEvent?.Invoke(this, EventArgs.Empty);
    }

    public void RaiseSecondEvent()
    {
        SecondEvent?.Invoke(this, EventArgs.Empty);
    }

    public void RaiseThirdEvent()
    {
        ThirdEvent?.Invoke(this, EventArgs.Empty);
    }
}

[Test]
public void Test()
{
    var myObj = new MyClass();

    using (var monitor = myObj.Monitor())
    {
        myObj.RaiseFirstEvent();
        myObj.RaiseSecondEvent();
        myObj.RaiseThirdEvent();

        monitor.OccurredEvents[0].EventName.Should().Be(nameof(myObj.FirstEvent));
        monitor.OccurredEvents[1].EventName.Should().Be(nameof(myObj.SecondEvent));
        monitor.OccurredEvents[2].EventName.Should().Be(nameof(myObj.ThirdEvent));
    }
}