Adding a convention to the list

This is pretty self-explanatory, I would like a convention to be added to the list. Here it is: http://www.mondocon.hu/mondocon-summer-2015/ (the summer con is already over, it's held every 3 months approx). I would like that to be an option in the list, since it could potentially help me and others find people around them. PS. I hope this is the right place to post this.