Last month, we covered the announcement of an official Steins;Gate 0-themed event at Anime Expo 2019, to be hosted by Funimation. Unfortunately, it seems as though those who were interested in the event are out of luck, as Funimation has handled the distribution of tickets and information on the event in ways that are disjointed and perplexing.
Community member RedBardIsCool has written an insightful piece on the issue which can be found here. This article describes Funimation’s failures in relation to the event in a manner that is both well-researched and comprehensive. We highly recommend giving it a read.