def get_display_text_for_event(event):
    """
    Takes an event from a collection exercise and returns a version of it that can be displayed to the user.
    If the string isn't found in the map, it just returns the string the function was given.

    :param event: A name of an event from a collection exercise
    :type event: str
    :return: A version of that event that can be displayed to the user
    """
    mapping = {
        "mps": "MPS (Main print selection)",
        "go_live": "Go live",
        "return_by": "Return by",
        "reminder": "First reminder",
        "reminder2": "Second reminder",
        "reminder3": "Third reminder",
        "nudge_email_0": "First nudge email",
        "nudge_email_1": "Second nudge email",
        "nudge_email_2": "Third nudge email",
        "nudge_email_3": "Fourth nudge email",
        "nudge_email_4": "Fifth nudge email",
        "exercise_end": "Exercise end",
    }
    return mapping.get(event, event)