Mark your calendars, folks – there’s another Facebook press event on the horizon.

This one will take place on June 20th at their Menlo Park HQ.

Facebook usually sends out its press invites via email – but this is not the case for this upcoming event. These invites came the old-fashioned way – snail mail.

ABC News posted an image of the invite, which keeps with the Facebook tradition of non-specific, no-frills press invites. All it says is “A small team has been working on a big idea. Join us for coffee and learn about a new product.”

So we know it will be a new product launch, and that’s about it.

Recent product launches that Facebook has held big press events for include Graph Search, the New News Feed, and Facebook Home.

Earlier this week, Facebook launched hashtags. They said that it was part of a bigger move to “bring public conversations to the forefront.” They also said it was just the beginning of a series of future roll outs to help with these public conversations.

“We will be rolling out a series of features that surface some of the interesting discussions people are having about public events, people, and topics,” said Facebook.

Is this the “big idea” that Facebook is set to unveil? Who knows. As always, we’ll be covering the event.

[Image via Facebook]