Is there a Enn Chant for Hagith?
There is no Enn, and @DarkestKnight can better explain the history of Enns. The Olympic Spirits predate Enns in European magick I believe. But all you need is his sigil.
So how do I contact or summon the spirit Hagith?
Use a method like this:
Although I would recommend the method given in the chapter “Olympic Chaos Magick” In the book “Master Works of Chaos Magick” by Adam Blackthorne, it’s very similar to the above but improved in some ways. The method has also been used for the Olympic Spirits quite a bit since that’s what the chapter covers. However, both methods can work of course.