Pensacon is happening on the 19th up to the 21st of the month. What isn't happening is the scheduled appearance of Star Wars actors Peter Mayhew (Chewbacca) and Tim Rose (Admiral Ackbar) at the Pensacola, Florida convention due to filming obligations in London.
This was made clear in Pensacon's Facebook post:
Unfortunately, we have some bad news to report this morning, but we prefer to let you know as soon as we know something...
There wasn't any official announcement whether the two cancelled to film Star Wars: Episode VIII. However, Episode VIII is the only movie starring both actors slated to begin filming this month. Jessica Henwick (Jessika Pava) and Mike Quinn (Nien Nunb) are also set to make an appearance in the convention. If Mayhew and Rose are indeed filming Episode VIII, Henwick and Quinn's attendance remains uncertain.
This isn't really any big news or spoiler, but I'll take a guess and say some sort of Resistance is going down that needs the involvement of Chewie and Ackbar.
Too bad for Pensacon attendees, but good news in general for the Star Wars universe.