Am I the only person, who on seeing a date, is not able to effortlessly calculate what day of the week that is?

I find it very tedious to see some event I'm interested in, being advertised on some date. I have to turn to my calendar to discover, ah, in fact, that won't work because I have some other recurring commitment on that day of the week.

Event organisers: How hard is it to include the day of the week when you publish a date?

Remember you're writing once. Hopefully you'll have many readers. Don't offload cognitive work onto all of your readers that you could have avoided by being a tiny bit more thoughtful.