Secret Solstice is growing. Fast. Proof that the buzz around this Iceland festival has reached a bona fide fever pitch came today in an announcement from the fest itself that not only is Die Antwoord joining its 2016 lineup, it's also adding an entire extra fourth day to the festival and an extra glacier party.

This means there is so much demand for tickets to Secret Solstice that three festival days turned out to be not enough; organizers had to add a fourth day to satiate ravenous festies. And their über popular, wild glacier parties are so in demand (because, obviously) that festies who'd previously missed out on a chance to get in now have another chance to score one of 100 exclusive spots for the once-in-a-lifetime experience of literally raving inside a 10,000-year-old glacier. Click here to see if spots are still available.

It's also notable that, with the addition of favorite festival act Die Antwoord and other freshly announced acts, Secret Solstice's musical lineup is more high profile than ever. That move, coupled with those added festival days and experiences, signals a bright, robust future for the fest.

Secret Solstice's fast rise should come as no surprise to those who've been paying attention. Not only has it broken ground as the country's first ever annual outdoor international music festival that involves camping amidst Iceland's surreal landscapes and nonstop sunlight due to its proximity to the Arctic Circle – the fest's tickets keep selling out. According to AXS.com, in 2014, the first early-bird ticket release sold out in 14 minutes.

The first Secret Solstice has already been lauded as one of the top festivals by publications like Huffington Post, BBC, Guardian, TIME, Resident Advisor, and more.

The moral of the story? Get your Secret Solstice tickets now.