Booths are selling magic items (not Thayan Enclave items like potions and scrolls, but more uncommon goods), unusual spell components, robes, alchemical supplies, and other necessities of the wizard's art. Many booths are run by master craftsmen who offer common items--mugs, plates, staves, candles, and so forth--crafted in unusual designs or carrying unusual minor enchantments. A few booths specialize in small animals, and one is selling simulacra.
You grow excited for a moment when you see a shelf full of hourglasses, spyglasses, spectacles and glass oil lamps...but are slightly crestfallen to find that none of them resemble the item you seek.
The area within the stalls is extremely crowded, and after a bit you notice that the sky above the crater is growing dark. Globes of light ignite in midair all around the crater, bathing everything in pale radiance.
You begin to grow weary of fighting this crowd...