SELECTING selects everything, so instead of selecting , you would use the actual field names you want to select. For example, if you have a database with 3 fields, field1, field2, and field3, and wanted to select just fields 1 and 2, your query would look like
SELECT field1, field2 FROM yourtable
In your case, you want to select just the date, so you'd do something like
$query = "SELECT date_format(Date,'%W, %M %D %Y') as Date from maintable where Date >= CURRENT_DATE() order by Date asc";
$result = mysql_query($query);
The above would select just the field Date (you may need to change if that's not the name of your field in the db)
Cgraz