Call me old-fashioned but I like WGL. Unless you want to make it a name new people will understand more easily (so they know it is "warlight live tournaments" from the name or whatever) I don't see a need to change the name. Could just go back to WGL instead of WGL 3.10 though
What was the last number the orginal ones used? #100? I'm pretty sure we went over that because I think I was there for the 100th one and there were a couple that happened after I left.
You could call it WGL 2.0 #5 (because it is the new and improved version of WGL, not to do with the warlight patch we are using) which makes it obvious it is from the new set - by date just becomes a pain though because we (are supposed to) play on both sat and sun.
WGL #5 2015 would be more informative it shows year and week of the year (as wgl is almost every week) Also it will be more helpful to history in case of your inactivity or in any other cases