I found this neat film from Prelinger Archives made by NBC in 1947 about the radio, its history, and how a show gets produced and broadcasted to your home. It is great to watch if not for the many vintage radio models alone. The first 20 seconds of it are silent, so don't worry about your volume not being high enough.
Regarding OTR today, I am sad to report that this year's Friends of Old Time Radio will be the last convention. After 35 years, the FOTR have decided to go out with a bang rather than a whimper. Their founders are getting older, most of the actors who worked in old time radio are gone and they’d rather end the convention on our own terms. The final meet will be at the Ramada Plaza Hotel in Newark, N.J., on the third weekend in October (the 20th-23rd).
Because it is their final convention no expense will be spared to bring in as many of the living radio acting veterans we can find. They already have a lot of radio personalities lined-up, but they are still looking for any old time radio actors or other professionals such as writers, sound effects specialists, producers, casting agents, etc., who are interested in attending. Just contact them if you fill one of these roles and are interested.
The program is split between a day session that lasts from 9:00 a.m. - 5:30 p.m. and an evening program that has a buffet dinner followed by two radio show recreations, which I think is just awesome. You know what is the coolest part of the dinner part? The guests are distributed across the tables at dinner, so you will always have at least one celebrity at your table1 How cool is that? Anyway, if you you are interseted you should get your tickets now, they are really quite inexpensive, especially considering the amount of stuff planned for the convention.