Add: HackGT

[bl3rred]

Link to Hackathon

https://hack.gt

Any additional context? (Optional)

No response

[Jose-Gael-Cruz-Lopez]

Closing as a duplicate — HackGT is already listed.

It's in listings.json as HackGT 13 — Sep 25–27, 2026 (https://hack.gt/), state open, added via #127. No change needed.

Thanks for flagging it though — if you spot anything wrong with the existing entry (dates, deadline, status), open an issue and we'll fix it.