Enchantments overnight permits left after the lottery, released first come, first served on recreation.gov.
The Forest Service's own Enchantments page says demand for overnight permits far exceeds supply: about 75 percent are allocated through the pre-season advanced lottery held February 15 through March 1, where "typically less than 10% of applicants are successful", and remaining permits are then available first come, first served on recreation.gov. We watch both and alert when they open.
Updated , checked by hand against the target's own page.
Watched from fs.usda.gov, the target's own public page — not a reservation system we poll.