If you have some of this information earlier, that's even better. Send it as you receive it. Make sure the descriptions are what you expected.
Many speakers have several presentations, and mixups occur.
If you suspect something is awry, please contact the speaker directly. If your event is to be held at NIH, make sure the speaker is aware that NIH policy does not allow product sales on its campus. Door prizes help to boost attendance. If you arrange to have door prizes for your meeting, please let us know that as early as possible so that your valuable door prize information is included in the publicity for the meeting. Of course, having said all this, I'll take information about your event for e-publicity whenever I can get it, but publicity efforts are not nearly as productive when the information arrives within 2 weeks of the scheduled event.