CodeMash is a big, fun, general dev conference that is held each January in Sandusky, Ohio at an indoor water park. Over the past few years folks have really enjoyed the Elixir content.
General conference info: http://www.codemash.org/
Please note: the CFP closes midnight Aug 31. If you aren’t sure of what category/track to use “programming principles” works well for most Elixir content.
Also: if you have kids, you can bring them along for KidzMash (http://www.codemash.org/kidzmash/). I did that in 2016 and the whole family had a great time.