I'm not a filmmaker, but I just had to comment on this: I am trying to use Gathr AND Tugg! I chose to screen When Marnie Was There with Gathr and The Rocky Horror Picture Show (my current obsession) with Tugg.
I am actually attempting to use both services now. First, I am trying Gathr with When Marnie Was There...which isn't turning out well. No one has bought a ticket yet! Then, just today, I decided to see what Tugg had, and to my surprise, they had my current favorite movie of all time, The Rocky Horror Picture Show! I plan on having my local shadowcast attend or help out with the event!