Full solution for stack overflow answer http://stackoverflow.com/a/23707052/215752

gistfile1.cs

void Main()
{
   List<CalendarEvent> events = new List<CalendarEvent>() 
    {
      new CalendarEvent("1", new DateTime(2014,1,1,1,1,1),new DateTime(2015,1,1,1,1,1),"one") 
      { 
        EventTeamMembers = new List<TeamMember>() 
        {
           new TeamMember("sam spade","sam","sam"),
           new TeamMember("hogan long","hogan","long"),
           new TeamMember("gi joe","gi","joe"),
        }
      },
      new CalendarEvent("2", new DateTime(2014,2,2,2,2,2),new DateTime(2015,2,2,2,2,2),"two") 
      { 
        EventTeamMembers = new List<TeamMember>() 
        {
           new TeamMember("sam spade","sam","sam"),
        },
      },
      new CalendarEvent("3", new DateTime(2014,3,3,3,3,3),new DateTime(2015,3,3,3,3,3),"three") 
      { 
        EventTeamMembers = new List<TeamMember>() 
        {
           new TeamMember("three three","three","thee"),
        },
      },
      
    };
    
    var byMemberDate = events.SelectMany(e => e.EventTeamMembers.Select(m => new { evnt = e, member = m}))
                             .OrderBy(item => item.member.FullName)
                             .ThenBy(item => item.evnt.Start);
                 
    foreach(var item in byMemberDate)
      Console.WriteLine("Member = "+item.member.FullName+" Date = "+item.evnt.Start);
}

// Define other methods and classes here
public class CalendarEvent
{
    #region Internal Fields

        private readonly string _id;
        private DateTime _start;
        private DateTime _end;
        private string _eventname;

        private List<TeamMember> _eventteam;

    #endregion

    #region Const

        public CalendarEvent(string id, DateTime start, DateTime end, string evtname)
        {
            this._id = id;
            this._start = start;
            this._end = end;
            this._eventname = evtname;
        }

    #endregion

    #region Props

        public string ID { get { return _id; } }
        public DateTime Start { get { return _start; } }
        public DateTime End { get { return _end; } }
        public string EventName { get { return _eventname; } }

        public List<TeamMember> EventTeamMembers { get; set; }



    #endregion

}

public class TeamMember
{
    #region Internal Fields

        private readonly string _firstname;
        private readonly string _fullname;
        private readonly string _userid;

      //  private TeamRoles.TeamMemberRole _memberrole;

        //private string _resid;

    #endregion

    #region Const

        public TeamMember(string fullname, string firstname, string userid)
        {
            this._fullname = fullname;
            this._firstname = firstname;
            this._userid = userid;
            //this._resid = resid;
        }

    #endregion

    #region Props

        public string FirstName { get { return _firstname; } }
        public string FullName { get { return _fullname; } }
        public string UserId { get { return _userid; } }
        //public string SpeakerID { get { return _resid; } }

    //    public TeamRoles.TeamMemberRole TeamMemberRole { get; set; }

    #endregion

}

Note this example will run in LinqPad at LinqPad.net