The second sentence is just wrong; I assume it wasn't written by a native speaker. Only "on Friday" is correct.Hi, I wonder about this:
You can find, "I will go on Friday", but also I've found something like, "This topic will be considered at Friday."
Any advice will be well received.
They're both acceptable. "In a meeting" is more often used, but "at a meeting" is okay as well. But "in" or "at" Friday (or any day of the week or calendar date) is not okay.What really confused me:
She is now at a meeting.
She is now in a meeting.