$(() => {
  const SELECTOR = '.has-start-at'
  const SEARCH = /Недоступен до (.*)/
  const REPLACE = '$1'

  $(SELECTOR).each((_, el) => el.textContent = el.textContent.trim().replace(SEARCH, REPLACE))
})

$(() => {
  const SELECTOR = '.has-start-at'
  const SEARCH = /Дата и время начала (.*)/
  const REPLACE = '$1'

  $(SELECTOR).each((_, el) => el.textContent = el.textContent.trim().replace(SEARCH, REPLACE))
})