Read: How to Measure Anything: Finding the Value of Intangibles in Business by Douglas W. Hubbard

It answers a lot of your questions about data gathering in your business context.

Sometimes we have no-shows. I'm looking to reduce that. What resources are available about encouraging people to keep commitments?

Be sure that you focus on the right issue. Maybe the people don't show to the meetings because they make a rational decision that attending the meeting isn't the best use of their time. In that case you don't do you organisation any good by forcing people to waste more time in meetings.

Are there any non dark-arts Sales techniques for Enterprise (B2B) Sales that are backed up by science? (I've read Influence, but I'm dealing with whole organizations here)

Sales especially cold calling is a very emotional challenging activity. If you can do something that reduces the stress that your sales reps feel, they will work better. We like to interact with happy people and buy from them. How is the work environment set up? A lot of business environments completely ignore ergonomic aspects.

If you are looking for something that isn't dark-arts, that's the area where I would look. You might also want to read "The Charisma Myth" by Olivia Fox.