Is there a restriction on using

calendar

as the username? The reason I want to do it is because I am connecting it to my personal website and there is no point mentioning a username in the slug.

If

calendar

username it is available I'd say you go for it, but I think it's already picked up by someone. There isn't any restriction on that slug that I'm aware of.

No, I meant

self hosted

version. It seems this keyword is not available as username