For this the database and table would have to be changed to utf8mb4 and utf8mb4_unicode_ci.
Maybe a good idea for a future release.
In Joomla 5 most of the tables are alread in utf8mb4 and utf8mb4_unicode_ci and you can change it for JEM too.
I just tested it manually and it worked:
After a backup of you DB you can change it manually in phpmyadmin with
Code:
ALTER TABLE `PREFIX_jem_attachments` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_categories` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_cats_event_relations` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_config` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_countries` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_events` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_groupmembers` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_groups` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_register` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE `PREFIX_jem_venues` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
(and repalce PREFIX with your specific database prefix)
