Complex Linq Query

Question

I need to write a linq that give me max DetailRoot EventDate Where  DetailModel Color equals "Red". Review structure below

  Dictionary<string, List<DetailRoot>> dataList = Reporter.GetSiteData();

   public class DetailRoot
    {

        public string UserId{ get; set; }
        public string Session{ get; set; }

        public Datetime EventDate { get; set; }
        public IReadOnlyList<DetailModel> DetailList { get; set; }

    }

 public class DetailModel
    {
        public string ApplicationGuid { get; set; }
        public string ColorType { get; set; }

  }