Short answer: no.
Longer answer: Right now, our Briefings are sent only when we detect that you are meeting with someone new or relatively unfamiliar so that you can easily learn about their background. They're not meant to be daily meeting reminders, and we don't want to clutter your inbox with info on people you already know well.
If you find that you should've received a Briefing for a Contact in an upcoming meeting and didn't, please let us know! Every example you send in helps us to perfect our Briefing magic.