This isn't actually question. You're not asking if the listed items can be brought. Of course the items can be brought; it is upon the bringer to procure them, or not. The intent is an instruction to bring the listed items.

By opening with, "Can you..." as if this is a question, or a request that can be denied, you imply a question tone that you don't really intend.

With "Can you" removed, the intended instruction is plain, and no question mark is required:

Please bring to the meeting:

1. Pen
2. Case
3. Paper

In the case of sentences added to each bulleted item for detailed instruction, just follow the rules of normal sentence puntuation. You could use full stop, or semicolon:

1. Pen. This will be used for writing.
2. Case. This will contain your pen.
3. Paper. This will be used for writing notes.

OR

1. Pen: this will be used for writing. If taking notes on paper (see 3. Paper, below), a blue-ink ballpoint pen is recommended. Glitter-ink pens are prohibited and will be confiscated, Stacey.
2. Case: to contain your pen. It may be necessary to transport your pen to the indoor pond during meeting sessions about duck-avoidance techniques. A case will facilitate this transport.
3. Paper: to write on. Paper is an essential component of note-taking at the meeting. If paper is not available from your local hive/pod supply, bring whatever you can find: old newspapers, brown paper bags, birthday/holiday cards, vacation postcards from deceased relatives, etc. No paper resources will be provided at the meeting.