Hi Rosie! Welcome to the Expatriate Café!
Good move on your part, wanting to make connections before coming to Spain. You have come to a good place to do so! Just so you know, both Tony and I are based here in Madrid, so feel free to get in touch with us... best way is through the board.
With regards to where teachers hangout... hmmm that´s such a subjective question because teachers are of all sorts. For example, I socialize frequently with expats, but don´t make it a specific objective to \"hang out\" with teachers. Although I am sure that if I walk into one of the hundreds of Irish bars here in Madrid, I will definitely find more than one teacher

.
I cannot speak for Seville, perhaps one of our other board members can... but Madrid has a wealth of options for people teaching here. In fact, Tony and I are trying to organize a first
Expatriate Café get together. If you are around then, feel free to let us know!
Some of the resources you might want to check are publications such as
In Madrid, a free monthly newspaper in English.
Join a professional organization such as
TESOL Spain.
You could try organzining a teacher get together by putting a post on this board and see who joins you.
Also, English bookstores (such as Booksellers in Madrid) have bulletin boards where you can post ads and messages for others to read and get in touch with you.
Just a few ideas to get you started!