Narrative Magazine, which publishes work of the highest literary caliber from established and emerging writers, also features resources for writers. Here's a link to their database of writer conferences — http://www.narrativemagazine.com/writers-resources/conferences

Erica Verrillo, the author of numerous books, has a publishing blog filled with resources for writers, including Writing Conferences.

http://publishedtodeath.blogspot.com/p/writers-conferences.html

The Community of Writers in Squaw Valley, CA, is also considered one of the best conferences in the country. https://communityofwriters.org

Considered by many as the gold standard of conferences.

http://www.middlebury.edu/bread-loaf-conferences