your local orchid society should have information on upcoming shows, and members will probably show off their plants at the meetings, and possibly have some for sale.
You don't need to be a member of an orchid society. The local orchid society will be hosting the local shows, so they'll be able to tell you when and where they are.
The local orchid society will also know about regional events, and local greenhouses which sell orchids.
Most local orchid societies will also welcome guests at their meetings, so you could attend one to see if you want to join.