This is the best summary I could come up with:

For the third consecutive year, the young leftwingers with mohawks, torn T-shirts and facial piercings began descending on Sylt at the weekend, mainly by train, to disrupt the seasonal repose of the elites.

The Aktion Sylt pressure group said it aimed to make “safe retreats for fascist subsidy collectors, tax-evading Nazi heirs and backward world destroyers things of the past!”

Their presence has been registered with the authorities, who have ordered the encampment’s residents to sleep in tents, use chemical toilets and dispose of their own litter until the site is dismantled by midday on 6 September, said Hans-Martin Slopianka, a district spokesperson for North Frisia.

Marvin Bederke of Aktion Sylt said he expected up to 300 participants – the agreed limit – at the improvised campsite near the local airport, where private planes bring the rich and famous of the EU’s top economy to enjoy the island’s windswept charms.

Activists criticise the “gentrification” in the community’s small villages, meaning that most people who work at Sylt’s designer shops, restaurants, bars and private clubs often can no longer afford to live on the island and have to commute.

The leftwing author and trade union official Marco Höne will travel from Stuttgart in the south-west for a gathering on 7 August titled Your Wealth Makes Me Throw Up, where he will read from his book Rich and Ugly.

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See? If you call it an invasion, your leftist buddies will not question the weekend you spend on elite island. :D

It's about as punk as a church summer camp. Maybe less booze.