Check the facts. If they didn't, their names won't be included in the final program. If you receive no response either way from NSTA, it does NOT mean that your session could not be accomodated. Those whose proposals are cannot be accomodated are the first to be contacted. Many presenters will give their school address, and so do not receive their letters during the school break.
Many presenters enjoy having a presider, who introduces the session.
Many people would like to be presiders, and we can assign a presider to your session if you don't have anyone in mind. If you wish to add a presenter to your session, you may. Any new presenters will have to submit their names, contact information, and affiliations. They must also sign and submit the safety form in order to be included in the Final Program. Safety guidelines and forms are available from the Presenters Forms page.