Another free 2018 calendar for you. This one folds flat for posting. Slide the bottom tab to prop it up. January-June's on the front, flip for July-December.
Here's your free printable 2018 calendar:
As for making, there's nothing much to know. Print, cut - taking care to cut the curved notch carefully. Crease the folds - joining at top.
I have given you a jumbo-size desktop calendar, but my personal preference is to print it at 80% size - then it fits neatly into a C6 envelope!
Save the dates - and have a great '18. :)