Half-Torah/הַפְטָרָה - Ki Savo, 6th of Consolation: "Rise & Shine!" - What is the Or HaGanuz and Where Can You Get Some? (Yishaiyah 60:1-22) (ו׳ משבע דנחמתא)

The mysterious 'Stored Light' of Creation shines throughout our Haftarah as the Navi calls upon us to celebrate. The problem is that we're still reading the Shiva D'Nechamasa (Seven of Consolation). Consolation and celebration are not the same thing. Why should we celebrate now? Is the 'light' already shining somewhere?