Inviting Co-workers

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1. I work in an office of about 25-30 people.  I only talk to about 5 or 6 people on a regular basis.  Who should I invite?  Does that include my boss?  I do talk to her occasionally but, I don't want to leave anyone out.  If I invite 5 people that means 5+ a guest=10 people.  Is that about right?

2. What are some neat and creative program ideas?  I figure I could get really creative with the programs because it might be cheaper.  With invitations the more creative the more bulkier (usually) which means more postage.  Any creative program ideas out there?