Pen in

She wanted to say regardless of who got the contract, they should get out a calendar and pen it in.

That's what I encourage you to do, too: pick a time with your partner that will generally work for both of you and pen it in to your calendars, bearing in mind that you will probably need to adjust it every now and then.

So check this out, take out your planner, pen it in, and pass it on!

In fact, Peters had to pen in the date himself to mark the visit to the murderous mother in the hospital since he misentered it under March 16 instead of the fourteenth.