Each year I invite my former students to have lunch with me to catch up and to sustain that student-teacher relationship that I worked to build the previous year.
These are the invitations I use each year. The file includes options for hand printing and an editable PDF file. The PDF file has 3 fields, the top field will let you personalize your text while fields 2 and 3 will autofill for quick printing.
I print them on card stock and deliver them to their current school year teachers. The font is KG Blank Space Solid which you will need to download from TpT for free if you want your invites to look like my sample.