Implement "special games" game check for badge handling

inventory.py

@@ -455,10 +455,12 @@ class DropsCampaign:
                 channel is None or (  # channel isn't specified,
                     # or there's no ACL, or the channel is in the ACL
                     (not self.allowed_channels or channel in self.allowed_channels)
-                    # and the channel is live and playing the campaign's game
+                    # and the channel is live and playing the campaign's game,
+                    # or this campaign can be earned anywhere (special game)
                     and (
                         ignore_channel_status
                         or channel.game is not None and channel.game == self.game
+                        or self.game.is_special_events()
                     )
                 )
             )