Thursday night is usually the night when other activities occur. Eg., Just about all sports train/play on a Thursday night (I know this puts Marty and I out or late for most of the Thursday races) as well as community events, late night shopping, etc.
Also, with already having the "main" racing night once a week others may divide their time up between other games that would run on a Thursday night.
If you want to get more people attending, maybe there should be a poll to see which night suits people the most. Personally, I think Sunday night is a good one as most people aren't doing anything then and it still leaves Monday night free if people want to have a bit of practice before the Tuesday night league races.
Of course, goes without saying that not everybody has the time to devote two nights a week to racing! It wasn't a criticism or anything, just an observation
