@mcguirejajm, I registered in March for the October exam. You need to either keep checking the CAPLE site, or check /r/Portuguese on Reddit or other Portuguese language forums to see when they open the registration for the next CIPLE exams. Someone may alert when they open up.
The A2 test, CIPLE, is very popular because it is the minimum needed for citizenship. It does sell out. However my wife just recently registered for the November 9, B1 test in Leiria. So if you are very confident you could see if that test is available.
I have read somewhere, either here or Reddit, that planes fly over the Lisbon site and people found it interfered with the audio portion. You might consider the Leiria test site. It is a 15 minute walk from the Rodoviária, and there are good restaurants and a nice walkable downtown near the test for you to enjoy your free time.