Many hardcore guilds have already been at the last two bosses of Karazhan. This will be old news to them. However, there are mid-level and low-level guilds that are starting to catch up attempting Attumen the Huntsman and his horse Midnight at the stables. Others are at Maiden the Virtue or at Moroes.
Today, I share my experience at the Opera Hall event. It is an amusing event that really requires focus, micro-management, coordination and teamwork. Take a look at the strategy if you are planning to hit the Opera Event. Check out the video at the bottom of the strategy page.