Maintenance for the week of March 24:
• PC/Mac: NA and EU megaservers for patch maintenance – March 24, 4:00AM EDT (8:00 UTC) - 10:00AM EDT (14:00 UTC)
• Xbox: NA and EU megaservers for patch maintenance – March 26, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
• Playstation®: NA and EU megaservers for patch maintenance – March 26, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
If you want to get it free as part of the current event, then yes you need to own blackwood during the event to get it. You can buy it separately when it comes out if you don't want to buy Blackwood