I am fairly new to this district that I'm in, I worked in other districts before where they are very lenient. I sent out an e-mail to all of my colleagues and principal asking if they would like to go to a free teacher event. It's for after school hours on a weekend. The principal emailed me back saying we need to talk about this. Was I not allowed to invite my colleagues out? It is not a school function, I invited many of my friends + colleagues so I did not see that I needed permission such as a christmas party etc.