How can I Include condition with ICollection Return

Hi

I have the following model. I am trying to add  some additional select with depends on the condition  Please can you help in my code

 public class Event
    {
        public int EventId { get; set; }
        public string EventName { get; set; }
        public DateTime EventDate { get; set; }

        [ForeignKey("VenueId")]
        public int VenueId { get; set; }
        public Venue Venue { get; set; }
        public ICollection<Gig> Gigs { get; set; }
    }

public class Gig
    {
        public int GigId { get; set; }
        public string GigHeadline { get; set; }
        public int GigLengthInMinutes { get; set; }

        [ForeignKey("EventId")]
        public int EventId { get; set; }
        public Event Event { get; set; }

        [ForeignKey("ComedianId")]
        public int ComedianId { get; set; }
        public Comedian Comedian { get; set; }
    }

 public class Venue
    {
        public int VenueId { get; set; }
        public string VenueName { get; set; }
        public string Street { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string ZipCode { get; set; }
        public int Seating { get; set; }
        public bool ServesAlcohol { get; set; }
    }

  public class Comedian
    {
        public int ComedianId { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string ContactPhone { get; set; }
    }

in dbContext
 public DbSet<Event> Events { get; set; }
 public DbSet<Comedian> Comedians { get; set; }
 public DbSet<Gig> Gigs { get; set; }
 public DbSet<Venue> Venues { get; set; }

I am trying to include statement with  conditionally in  the existing LinQ

 public ICollection<Event> GetEvents(bool includeGigs = false)
        {
            var _events = _db.Events.Include(v => v.Venue);
            // How can I add this condition with above _events 
          if (includeGigs)
            {
                _events = _events.Include(g => g.Gigs)
                             .ThenInclude(c => c.Comedian);
            }
// How can I add Order by condition with above _events 
            _events = _events.OrderBy(e => e.EventDate);
            return _events.ToList();
        }