does anybody knows a group or club of people interested in spanish in Oxford or nearby?

Answer 1

1. I can find nothing on the internet, but that is not surprising. Local language clubs tend to be small informal associations with no websites, and often no listings in local websites. You won't find anything here, for example.
http://www.locallife.co.uk/oxford/charities.asp

2. Here are some ideas that I have suggested for a previous and similar query.
a) Local library
When I lived in Southend-on-Sea, its Central Library's display boards were used by the local language clubs (German, French, Spanish) to publicise their activities on A4 posters. You may find the same at yours, but, in any case, libraries usually maintain a list of local voluntary associations and clubs, of all kinds.
b) Local media
Where I now live, in a very small town outside Bristol, the French Speaking Circle publicises its activities in the paid weekly newspaper, and a free monthly magazine. Have a look at your local media, and don't forget things like "Daily Info", "In Oxford" magazine, and community websites.
http://www.dailyinfo.co.uk/sheet/pdf/pdfpage.htm
http://www.inoxfordmag.co.uk/specs/products.html
http://www.oxfordcity.co.uk/oxford/home_community.html
http://www.woca.org.uk/
c) Instituto Cervantes Londres
This is a much longer shot, but the institute may know of local groups.
http://londres.cervantes.es/

3. Oddly, neither Oxford University Students' Union nor Oxford Brookes Students' Union seems to have a Spanish or Latin American Society.
http://www.ousu.org/content/index.php?page=6932
http://www.thesu.com/