For coin shows I just go to Google, type in coin shows and my state. large amount just pops up. Other sources can be found on web sites like
Coin World. Not sure but the PCGS web site also used to have a listing of coin shows. Don't just use one source. I have found some show calendars miss some shows for some strange reason. Some occationally list shows that were cancelled. Try different sources. I've noticed that some on line dealers have a link to other places where coin shows they will attend show up. Example is jmscoins on the far left side of the opening screen. If you live near a state border, you may want to also try finding coin shows in nearby states.