Ain’t no party like a Tesla party! The California-based luxury car company (turned battery company) is gearing up for the grand opening of its enormous Gigafactory located outside Reno, Nevada. Tesla announced late last week that the battery factory will open in just two months, with a celebration scheduled for July 29. Oddly, this grand opening will be a lot different than most others, in that the factory is nowhere near fully operational and construction will continue long after party goers have gone home.

Fortune broke the news last week, describing the event as a sort of customer appreciation party. Some Tesla customers learned about the bash via email, when they were informed about winning tickets to the July 29 event—a perk the company extended to previous buyers who referred at least five new Tesla owners. The email doesn’t say much about what will happen at the grand opening party or who else might be in attendance, but it’s probably safe to assume the company’s CEO Elon Musk would join in the revelry. (He’s a pretty fun guy, after all.) Those lucky Tesla owners could be the first members of the public to see inside the giant facility, where Tesla is already manufacturing Powerwall batteries for commercial clients.

Related: Take a first look inside Tesla’s Gigafactory

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It’s difficult to say how much of the factory will have been built prior to party time. Actually, Tesla has already held a number of smaller (also private) events in the areas of the Gigafactory where construction is complete. As of the beginning of May, Bloomberg estimates only 14 percent of the factory had been constructed. There are no updates to suggest how much will be finished by the end of July.

The massive $5 billion factory has a footprint spanning 130 acres, making it arguably the largest building in the world. We hope Tesla remembered to invite the folks from the Guinness Book of World Records to the party. Hopefully, they will also invite some members of the press to cover the event, so that nobody has to risk getting arrested just to get a look around.

Via CNET

Images via QLC Tech Videos (screenshot)