They abused my calendar too, luckily I pay for access to the game so I managed to report them and it had disappeared the next time I logged in so all’s well that ends well.
Nah it’s not, it’s boost spammers mass inviting people via calendar events, happened to me on AD and I know 100% it wasn’t my guild because my guild only does events via discord and never uses the in game calendar and neither does my RP only guild offer pvp boosts to the entire realm 