Consider using Event Date or Graduation Date Here.
This will appear across the bottom of the certificate.
One per line, or comma-separated (e.g. pasted from a spreadsheet) — each one becomes one printed piece, in order. A blank entry is fine, it just prints that one piece blank.
Adds that many lines to the list above at once, instead of typing or pasting the same value repeatedly. Leave the value blank and set a count to add that many blank copies instead (handy for extra reserve pieces).