Linkhandler

With a proper configuration of linkhandler function you can select events in Link wizards and RTE. Details at https://usetypo3.com/linkhandler.html This configuration is enabled by default.

Page TS Config

TCEMAIN {
  linkHandler {
    tx_calendarize_domain_model_event {
      handler = TYPO3\CMS\Backend\LinkHandler\RecordLinkHandler
      label = Events
      configuration {
        table = tx_calendarize_domain_model_event
        storagePid = xxx
        hidePageTree = 1
      }
      scanAfter = page
    }
  }
}