Maintenance for the week of September 22:
• NA megaservers for maintenance – September 22, 4:00AM EDT (8:00 UTC) - 10:00AM EDT (14:00 UTC)
• EU megaservers for maintenance – September 22, 8:00 UTC (4:00AM EDT) - 14:00 UTC (10:00AM EDT)
Maybe you mean the Explorer's Celebration? It's kind of part in the current event already - the more quests the community completed the more days this celebration will take place. As this meter is on 100% already we are having 9 more days, starting immediately after "Fallen Leaves" ends.
PC EU
1 Healer, 1 Tank, 3 DD, 5 more Toons just for fun