To export a print of your film for your screening with NewFilmmakers, YoungFilmmakers, or AltFest please follow these steps.
Select Export > Media from the File dropdown menu
Once in the Export Screen select Quicktime
Rename your file following the naming conventions "NameOfFilm_DirectorsName_ScreeningDate.mov" (Screening dates should be numerical as shown below)
Select the video tab and change the codec to H264
Make sure that your aspect ratio matches an accepted 1920 aspect.
Also check to make sure that the aspect is set to "Square Pixels"
1920x818 (2.35 - scope)
Finally scroll to the bottom of the Video Tab and select Limit Data Rate and set it to 15,000
If you are exporting 5.1 surround sound select the Audio Tab select uncompressed audio and set the channels to 6 with the correct channel mapping (double check with sound editor)