In our industry 99% of it all comes directly from us either creating press materials ourselves or hiring someone that is a pro in the marketing industry to do it for us, either way it is a MUST.
Listing up-coming dates on your web-site as well as any Newsletter you may send out is all part of NORMAL BUSINESS OPERATIONS. At the same time posting a few quotes from past clients, especially those from your more recent gigs, is likewise a powerful means of luring in new business.
People can't buy something they've never heard of. While word-of-mouth is the most important PR we can ask for, we do need to start the wheel moving in order to shift the proverbial energy to our favor. It was explained to me this way, "People love to jump onto a moving train that's heading forward. The more support they see on that train the more willing they are to trust it and take a ride on it. . ."
The Moral of the Story Is. . . the more busy you appear, the more kind and encouraging words you can post to your web site from satisfied clients, the more momentum you "train" gains; people want to take a ride because it is popular -- successful.
Your web-site should be kept clean/crisp and not filled with flash and silliness. Professional people simply want the facts in a short, concise manner so give them to them... have a few clips of past performances, feature quotes from previous clients in some eye-catching manner, and have your schedule up and CURRENT at all times; maybe even highlighting certain events that are open to the public or for charity, etc. The other thing that has become "proper" with many sites (not just magic) is pdf downloads of brochures and press kits so you may want to think about that as well.
As I mentioned, we generally end up being the one that designs all this stuff initially BUT, if and when you have the funds, HIRE A PROFESSIONAL in the marketing & public relations world to work with you in establishing a polished public image via your web site and all printed materials as well as how you look, the materials you present (theme), and so forth. This is the most important and frequently over-looked (ignored) step. In the book HUSTLE, HUSTLE Joel Bauer tells you to invest over 2/3rds of your income back into yourself and your business. If you go to business school you'll discover that most people that start a new venture do not take a salary for the first 2-5 years so as to throw every penny back into that project; it is an INVESTMENT after all and in order to fuel success you must feed the venture the substance it thrives on -- CASH!
I've drifted a bit off topic but I hope you can understand why. . . hope this helps.