Add project files.

PracticeCalendar.Domain/Entities/PracticeEvent.cs

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+using Ardalis.GuardClauses;
+using PracticeCalendar.Domain.Common;
+using PracticeCalendar.Domain.Common.Interfaces;
+using PracticeCalendar.Domain.Events;
+using PracticeCalendar.Domain.Exceptions;
+
+namespace PracticeCalendar.Domain.Entities
+{
+    /// <summary>
+    /// Practice event aggregate
+    /// </summary>
+    public class PracticeEvent : EntityBase, IAggregateRoot
+    {
+        public PracticeEvent(string title, string description)
+        {
+            Guard.Against.NullOrEmpty(title, nameof(title));
+            Guard.Against.NullOrEmpty(description, nameof(description));
+            this.Title = title;
+            this.Description = description;
+        }
+
+        public string Title { get; private set; } = string.Empty;
+        public string Description{ get; private set; } = string.Empty;
+
+        private List<Attendee> attendees = new List<Attendee>();
+        public IEnumerable<Attendee> Attendees => attendees.AsReadOnly();
+
+        public DateTime StartTime { get; private set; }
+        public DateTime EndTime { get; private set; }
+
+        public void AddAttendee(Attendee attendee)
+        {
+            Guard.Against.Null(attendee, nameof(attendee));
+            attendee.AssignToEvent(this.Id);
+            attendees.Add(attendee);
+
+            var attendeeAddedEvent = new AttendeeAddedEvent(this, attendee);
+            base.RegisterDomainEvent(attendeeAddedEvent);
+        }
+
+        public void UpdateTitleAndDescription(string title, string description)
+        {
+            this.Title = title;
+            this.Description = description;
+        }
+
+        public void AttendeeAcceptEvent(int attendeeId)
+        {
+            var attendee = this.Attendees.FirstOrDefault(x => x.Id == attendeeId);
+            if (attendee == null)
+                throw new InvalidAttendeeException(attendeeId);
+            attendee.SetIsAttending(true);
+        }
+
+        public void AttendeeDeclineEvent(int attendeeId)
+        {
+            var attendee = this.Attendees.FirstOrDefault(x => x.Id == attendeeId);
+            if (attendee == null)
+                throw new InvalidAttendeeException(attendeeId);
+            attendee.SetIsAttending(false);
+        }
+    }
+}