Of course Sunny and (in particular) Charlie will be part of this game, but I also wanted to include the wonderful gifts I received just in time for this year's bingo.  So this is what I've come up with:

Called Squares:

My marker for called squares is inspired by LA's beautiful Halloween-themed handmade bookmark.

Read Squares:

My marker for read squares shows Mystery Cat Charlie with my Halloween socks from OB.

Called and Read Squares:

My marker for called and read squares has Charlie "blacking out" the respective square (without also featuring the net, though, which when trying out various designs I found obscures too much of Charlie's face; the net works much better with the actual squares of the bingo card).

Given his coloring, Charlie will of course be doing the heavy lifting, i.e. will be showing up on almost all of the [called and] read squares of my card, except for ...

Called = Read: Center Square

... the the center (raven) square, where read equals called, and where Mystery Cat Sunny will make his appeareance, Halloween socks in tow, once I've read a book I've decided to assign to that particular square.

Well folks, I'm getting all my Halloween Bingo 2017 stuff pulled together at my usual snail's pace, but hopefully my marker reveal was worth the wait. :)  Handing out trick-or-treat candy while watching Ghostbusters has been a Halloween tradition at our house for years, so going with a Ghostbusters theme was a no brainer. Then when the first bingo call to kick-off this year's game was the "Ghost" square I knew it was a sign!

   TA-DAH!!

 ***CALLED SQUARE***

            SLIMER              

 ***READ SQUARE***

STAY PUFT

 ***CALLED & READ SQUARE***

GHOSTBUSTERS

 So I'm fudging the "Read" and "Called & Read" squares for illustration

purposes, but here's what my card will look like. And I'm hoping to read a

 couple of short stories this week to catch up with all you speed readers!