Well. Given that Eladrin are the Magickey McMagicson race that they are, I would assume (and the canon does) that any place like Evermeet, Evereska, Myth Drannor, or any of the Feywild cities would have 1 or more 21st level + Archmage, fully capable of level 18 (and higher) rituals, haunting their grounds.
I would assume that, but I was thinking of a city in the natural world, and didn't know we were thinking of FR. Certainly a big eladrin city like Evermeet would have plenty of paragon and epic casters. (The "generic" eladrin in the MM1 are level 19 to 21 or so! Dark Sun has much more reasonably-leveled eladrin,. around 8th-level.)