Add CDN routes to get cover image

src/Discord.Net.Core/CDN.cs

@@ -208,6 +208,9 @@ namespace Discord
         public static string GetStickerUrl(ulong stickerId, StickerFormatType format = StickerFormatType.Png)
             => $"{DiscordConfig.CDNUrl}stickers/{stickerId}.{FormatToExtension(format)}";
 
+        public static string GetEventCoverImageUrl(ulong guildId, ulong eventId, string assetId, ImageFormat format = ImageFormat.Auto, ushort size = 1024)
+            => $"{DiscordConfig.CDNUrl}guild-events/{guildId}/{eventId}/{assetId}.{FormatToExtension(format, assetId)}?size={size}";
+
         private static string FormatToExtension(StickerFormatType format)
         {
             return format switch

src/Discord.Net.Core/Entities/Guilds/GuildScheduledEventsProperties.cs

@@ -58,6 +58,6 @@ namespace Discord
         /// <summary>
         ///     Gets or sets the banner image of the event.
         /// </summary>
-        public Optional<Image?> Image { get; set; }
+        public Optional<Image?> CoverImage { get; set; }
     }
 }

src/Discord.Net.Core/Entities/Guilds/IGuild.cs

@@ -1105,7 +1105,7 @@ namespace Discord
         /// </param>
         /// <param name="speakers">A collection of speakers for the event.</param>
         /// <param name="location">The location of the event; links are supported</param>
-        /// <param name="bannerImage">The optional banner image for the event.</param>
+        /// <param name="coverImage">The optional banner image for the event.</param>
         /// <param name="options">The options to be used when sending the request.</param>
         /// <returns>
         ///     A task that represents the asynchronous create operation.
@@ -1119,7 +1119,7 @@ namespace Discord
             DateTimeOffset? endTime = null,
             ulong? channelId = null,
             string location = null,
-            Image? bannerImage = null,
+            Image? coverImage = null,
             RequestOptions options = null);
 
         /// <summary>

src/Discord.Net.Core/Entities/Guilds/IGuildScheduledEvent.cs

@@ -39,6 +39,11 @@ namespace Discord
         /// </remarks>
         string Description { get; }
 
+        /// <summary>
+        ///     Gets the banner asset id of the event.
+        /// </summary>
+        string CoverImageId { get; }
+
         /// <summary>
         ///     Gets the start time of the event.
         /// </summary>
@@ -80,6 +85,14 @@ namespace Discord
         /// </summary>
         int? UserCount { get; }
 
+        /// <summary>
+        ///     Gets this events banner image url
+        /// </summary>
+        /// <param name="format">The format to return.</param>
+        /// <param name="size">The size of the image to return in. This can be any power of two between 16 and 2048.
+        /// <returns></returns>
+        string GetCoverImageUrl(ImageFormat format = ImageFormat.Auto, ushort size = 1024);
+
         /// <summary>
         ///     Starts the event.
         /// </summary>

src/Discord.Net.Rest/API/Common/GuildScheduledEvent.cs

@@ -39,5 +39,7 @@ namespace Discord.API
         public Optional<User> Creator { get; set; }
         [JsonProperty("user_count")]
         public Optional<int> UserCount { get; set; }
+        [JsonProperty("image")]
+        public string Image { get; set; }
     }
 }

src/Discord.Net.Rest/Entities/Guilds/GuildHelper.cs

@@ -800,9 +800,9 @@ namespace Discord.Rest
                 StartTime = args.StartTime,
                 Status = args.Status,
                 Type = args.Type,
-                Image = args.Image.IsSpecified
-                    ? args.Image.Value.HasValue
-                        ? args.Image.Value.Value.ToModel()
+                Image = args.CoverImage.IsSpecified
+                    ? args.CoverImage.Value.HasValue
+                        ? args.CoverImage.Value.Value.ToModel()
                         : null
                     : Optional<ImageModel?>.Unspecified
             };

src/Discord.Net.Rest/Entities/Guilds/RestGuildEvent.cs

@@ -28,6 +28,9 @@ namespace Discord.Rest
         /// <inheritdoc/>
         public string Description { get; private set; }
 
+        /// <inheritdoc/>
+        public string CoverImageId { get; private set; }
+
         /// <inheritdoc/>
         public DateTimeOffset StartTime { get; private set; }
 
@@ -98,8 +101,13 @@ namespace Discord.Rest
             EntityId = model.EntityId;
             Location = model.EntityMetadata?.Location.GetValueOrDefault();
             UserCount = model.UserCount.ToNullable();
+            CoverImageId = model.Image;
         }
 
+        /// <inheritdoc/>
+        public string GetCoverImageUrl(ImageFormat format = ImageFormat.Auto, ushort size = 1024)
+            => CDN.GetEventCoverImageUrl(Guild.Id, Id, CoverImageId, format, size);
+
         /// <inheritdoc/>
         public Task StartAsync(RequestOptions options = null)
             => ModifyAsync(x => x.Status = GuildScheduledEventStatus.Active);

src/Discord.Net.WebSocket/Entities/Guilds/SocketGuildEvent.cs

@@ -35,6 +35,9 @@ namespace Discord.WebSocket
         /// <inheritdoc/>
         public string Description { get; private set; }
 
+        /// <inheritdoc/>
+        public string CoverImageId { get; private set; }
+
         /// <inheritdoc/>
         public DateTimeOffset StartTime { get; private set; }
 
@@ -109,8 +112,13 @@ namespace Discord.WebSocket
             StartTime = model.ScheduledStartTime;
             Status = model.Status;
             UserCount = model.UserCount.ToNullable();
+            CoverImageId = model.Image;
         }
 
+        /// <inheritdoc/>
+        public string GetCoverImageUrl(ImageFormat format = ImageFormat.Auto, ushort size = 1024)
+            => CDN.GetEventCoverImageUrl(Guild.Id, Id, CoverImageId, format, size);
+
         /// <inheritdoc/>
         public Task DeleteAsync(RequestOptions options = null)
             => GuildHelper.DeleteEventAsync(Discord, this, options);