A wise article here by Jason Helopoulos. Upshot:
Are Christian conferences good? Yes. Should you attend? Yes. You don’t have to attend them all. Indeed, you shouldn’t! But it is helpful every once in a while to have your soul fed by a conference experience. Just do so with a little trepidation.
Read the whole thing to see both the good and the potential dangers.
If you do attend conferences, here’s a resource to copy or bookmark: Don Whitney’s “Ten Questions to Ask to Benefit from a Conference or Special Event.”