Alterando text do Form a partir de uma Thread

ChecadorDeLabel.cs

using System;
using System.Threading;

namespace FormsSandbox
{
    public class ChecadorDeLabel
    {
        public EventHandler<bool> _event;

        public ChecadorDeLabel()
        {
        }

        public void ChecaSeContagemEhPar()
        {
            int i = 0;
            while (true)
            {
                if (i % 2 == 0 )
                {
                    _event.Invoke(this, true);
                }
                else
                {
                    _event.Invoke(this, false);
                }
                Thread.Sleep(5000);
                i++;
            }
        }
    }
}

Form1.cs

using System;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace FormsSandbox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            ChecadorDeLabel checador = new ChecadorDeLabel();

            checador._event += new EventHandler<bool>(MetodoQualquer);

            Task.Run(()=> checador.ChecaSeContagemEhPar());
        }

        private void MetodoQualquer(object sender, bool e)
        {
            BeginInvoke((Action)delegate { labelTextoDeRodape.Visible = e; });
        }
    }
}