Add list of objects to another list C#

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C#

I am playing around with List<> of objects. I was trying to create a list of dates within a list. Basically an object list can contain i.e 3 dates.

Im not sure how to do it.

Class called people:

public string Name { get; set; }
public string Surname { get; set; }
public int Age { get; set; }
public List<Dates> numberOfDates{ get; set; } = new List<Dates>();

Class called Dates:

public DateTime date { get; set; }

What I have tried:

In my main form I have two event handlers. One is AddPerson second is AddDates Basically when you add dates I want it to save into the AddPerson button to added into the object (If that make sense).

private void AddPerson(object sender, EventArgs e)
{
Person person = new Person();
person.Name = txtFirstName.Text;
person.Surname = txtSurname.Text;
person.Age = int.Parse(txtAge.Text);

 private void btnAddDates_Click_1(object sender, EventArgs e)
        {
People people = new People();
Dates dates= new Dates();

dates.date = dtpClaim.Value; //dtp is the date time picker                  people.numberOfDates.Add(dates);
        }

In short, once I add a date/dates in the addDates event, it will add it to the specific person in the addPerson event.