Chess club in a collage

College.

A collage is a collection of items pasted to a board in an artistic fashion.

That is one nice chess collage.

https://stushieart.com/2013/07/12/chess-art-chess-collage-by-stushie/

I doubt that many colleges have collected such nice collages for their colleagues.

There is no simple answer. Just like any other club, the number of members and strength of those members can be anything.

If you want to create internal ratings for your club so people can know how they rank against each other, you could use this calculator I made: http://qa76.net/elo.

This would NOT be a valid rating outside the club as it only rates them against each other.  But I find this useful rather than doing something like trying to have everyone in the club maintain a rating at a place like chess.com.