There are. GopherCons are a thing. Also, here's an ad for the upcoming GopherConAU : https://gophercon.com.au.
CFPs are open until end of June. https://papercall.io/gophercon-au-2019
CFPs are open until end of June. https://papercall.io/gophercon-au-2019
The only thing that doesn't exist is a C conference, but that's because C is the least common denominator.
Pretty sure that there are Go conferences.