But if you're going to have Mondays and Thursdays as race nights, have Mondays and Thursdays as racenights, not just the odd one here and there.
Let's take Sheffield as an example, who race on Thursdays. They opened their season on April 2nd, and were back the next week. Away on the 16th, but nothing on the 23rd or 30th of April. Home again on May 7th and May 14th, but nothing on May 21st or May 28th, although they did run on Bank Holiday Monday (25th) to cover one of those. That's potentially four lost meetings. June, July, and August look much better, perhaps because of the imbalance between Monday and Thursday tracks, but even then July 2nd is empty. A total of 5 missing Thursdays.
For a Monday track like Belle Vue, it's a bit more stark. They opened on March 16th and skipped a week before league racing began, running 2 weeks before taking a week off. They raced on April 20th, then took another week off, had a home meeting and an away meeting on the next 2 Mondays, then another week off, another week on, another 2 weeks off. June picks up well after that but that first date in July is missing again, followed by a home and an away and another blank week. August has 2 home meetings and then 2 weeks off, before coming back for the Bank Holiday. So that's 9 Mondays off!