'Specified cast is not valid' error on call to SQL Server stored procedure

I'm calling a stored procedure in a SQL Server database with the following code.

The idea is to add the relevant events to a list that is a property of the EventSchedule model, but the code is returning a

Specified cast is not valid

error. The stored procedure pulls data from a view I've built. The call stack shows the error is at line 96, not sure if that'll help anyone much. I think I may need another set of eyes to see what I'm missing here.

var command = new SqlCommand("GetEvents", conn)
{
    CommandType = CommandType.StoredProcedure
};

command.Parameters.Add(new SqlParameter("Id", SqlDbType.BigInt, 0, "id"));
command.Parameters[0].Value = schedule.LeagueId;

using (var reader = command.ExecuteReader())
{
    while (reader.Read())
    {
        //line 96
        var _event = new Event
        {
            EventId = (Int64) reader["eventid"],
            HomeTeamId = (Int64) reader["home_team_id"],
            TeamName = (string) reader["team_name"],
            HomeTeamScore = (int) reader["home_team_score"],
            AwayTeamId = (Int64) reader["away_team_id"],
            AwayTeamName = (string) reader["Expr1"],
            AwayTeamScore = (int) reader["away_team_score"],
            WinningTeamId = (Int64) reader["winning_teamid"],
            EventStartDttm = (DateTime) reader["event_start_dttm"],
            CurrentDttm = (DateTime) reader["current_dttm"],
            Locked = (bool) reader["locked"]
        };

        schedule.Events.Add(_event);
    }
}

return schedule;

Models:

public class EventSchedule
{
    public Int64 UserId { get; set; }
    public Int64 LeagueId { get; set; }
    public string League { get; set; }
    public int Season { get; set; }
    public int Week { get; set; }
    public IList<Event> Events { get; set; }
}

public class Event
{
    public Int64 EventId { get; set; }
    public Int64 HomeTeamId { get; set; }
    public string TeamName { get; set; }
    public int? HomeTeamScore { get; set; }
    public Int64 AwayTeamId { get; set; }
    public string AwayTeamName { get; set; }
    public int? AwayTeamScore { get; set; }
    public Int64 WinningTeamId { get; set; }
    public DateTime EventStartDttm { get; set; }
    public DateTime CurrentDttm { get; set; }
    public bool Locked { get; set; }
}

Stored proc:

ALTER PROCEDURE [dbo].[GetEvents]
    @Id int
AS
BEGIN
    SET NOCOUNT ON;

    SELECT 
       eventid, 
       home_team_id, 
       team_name, 
       home_team_score, 
       away_team_id, 
       Expr1, 
       away_team_score, 
       winning_teamid, 
       event_start_dttm, 
       current_dttm, 
       locked 
    FROM 
       leagueScheduleForCurrentWeek 
    WHERE 
       id = @Id
END