I should make a few notes.. in the title of your post you say "where date is greater than yesterday plus 10"
today >= (yesterday + 10)
But the text of the post reads "where the date is today <= 10 days in advance".
today <= (today + 10 days)
I gave you an example based upon the later... If you need an example of the former, it would be: DATE >= DATEADD(d, 9, GETDATE())
I should note that I didn't put a lower limit on that... so a more complete example might be:
SELECT * FROM FIXTURES WHERE Event_id = " & event & " AND DATE >= GETDATE() AND DATE <= DATEADD(d, 10, GETDATE())"
This would give you all rows who's "date" field is greater than, or equal to, today, but less than, or equal to, 10 days in advance. To go backwards in the calendar (to get say, yesterday's date), you would use a negative number: DATEADD(d, -1, GETDATE())