Oh no! It is likely due to daylight saving time: in my timezone, the time switched from 09:00 to 08:00.
The UTC remained stable.
I do not know how Discourse detects your timezone and I am not sure how to override that. In the future I’ll make sure I also include the UTC time in clear text so that people can also do the conversion on their side. Sorry about that!
By the way, if both the forum and Google Calendar show the event at 8am while it was at 7am for you, I would say it is likely that your browser is misconfigured and sending wrong timezone settings to the websites you visit, no? Are you getting this problem on any other website?
Just to make sure there is no misunderstanding, there is no expectation that anyone in particular should be there, it’s really just a space to put faces / voices on usernames. If you want to avoid missing further meetings, I hope the calendar above is helpful.