At the end of the day on April 17th, which was the final day to enter the Senior USBC and be guaranteed to be able to play, there were 11 teams entered in the event. Up to 5 additional teams would improve the format, so entries will remain open until May 3rd or when a total of 16 teams have entered, whichever is earlier. To enter, log in to the USBF site. After you log in, you will see a message saying whether you have paid your dues for 2017. If you have not done so, you must pay dues before you can enter the Senior USBC. The page you get when you log in has links to the pages where you can pay dues for one or three years. After paying dues, you will have to log out and back in for the website to recognize that you have paid dues (sorry, I don't know why that is). When you are logged in and have paid dues, click on "Enter Senior USBC" under the User Menu and follow directions to enter a team. If you have any problems along the way, email Jan and I'll try to help you. If you are not registered on the USBF site, you can Join USBF by clicking on Join at the top right of any page on usbf.org.
The format for the Senior USBC is now fixed, except for the first stage. If the number of teams is between 11 and 14, the first stage will be a 1-1/2 day Round Robin. If there are 15 or 16 teams, the first stage will be a 1-1/2 day, 90 board KO. The USA1 bracket will continue with 1-1/2 day, 90 board Quarterfinal, Semifinal and Final matches. Teams that do not qualify for USA1 and teams that are eliminated in USA1 drop into the USA2 bracket, where there will be Round Robins or KO matches opposite each of the USA1 stages. The losing USA1 Finalist will drop into the USA2 Semifinal and choose their opponent from the 3 teams remaining in USA2.
The Senior USBC has no byes, so if you enter and the first stage is a Round Robin, you will have the opportunity to play against the current World Senior Bowl champions, as well as many other World and National Champions. Teams that are entered now are listed on the USBF site here.
Plus... it's free!