Fix charity race weekday annotation

[huyubiao]

        {
          "speaker": "Melanie",
          "dia_id": "D2:1",
          "text": "Hey Caroline, since we last chatted, I've had a lot of things happening to me. I ran a charity race for mental health last Saturday \u2013 it was really rewarding. Really made me think about taking care of our minds."
        },