!!! english language question !!!
a is used for an indefinite object and the is used for a definite object
let's imagine a situation where:
i went to a reading club at my uni
we read a paper together
one of the participants in the club said:
"Thanks for today – a really interesting paper and a great group of people."
we all read the same paper
we all know the members of the club
WHY DID THEY USE A??????
💀
@mametsuko
I think the issue with your example sentence is that it's an enumeration. Here "a" stands for as a way of counting. The sentence is an equivalent with: "Thanks for today: one really interesting paper and one great group of people."
There could have been multiple interesting papers, and the sentence becomes: "thanks for today: several really interesting papers and... ".
If you break it apart, you could have: "Thanks for the interesting paper, and (thanks) for the great group of people". Although, I find "the great group of people" by itself a bit strange. From the sentence context, "the group" doesn't sound that well defined. I'd expand it to "the great group of people here". Or "the great group of people in this club".
@alyx@gameliberty.club 
thank you!