Hey hosie The sunday season is the main league and you may be able to get a late placing if you submit your time, given that some of the divisions arent full. There is Seido's races which he runs regualrly and Anon's series which have just finished but may be another one soon. If you get stuck with how to submit a qualififer here is how to do it http://raceonoz.com/forum/viewtopic.php?id=895
You can also ask to be added to some members friends list and there is nearly always a practice room going during the week. Lots of fun and good racing going on in them too. Find out what Division you are in and go to the GT5 league thread and season 6 your division post, all the guys racing in your division are listed there in the first posts.
Thanks bonus. Well I know a few of my mates are in division 3 so would be good to race with them but I won't know till I do my qualify and email it through.