" Validation" is basically how well the site preforms when compared to the "standards" set about html files. a validation error can be anything from a spelling error up to using something that doesnt exist. And your site is allowed to be in Serbian as long as there is an obvious english translation, ( or a number of other languages, im unsure of the exact list)
nightlife0230.co.nr
please post a link next time
Review:
I like the overall look of the site, seems to fit your target audience