It was slated to open in September–SEPTEMBER- but it will not for the second year in a row. Here is their tweet:
LA County Fair @lacountyfair
Amid the uncertainty of the COVID-19 pandemic and its bearing on public events, we announce today that we are planning a smaller, safer celebration of this year’s #LACountyFair, which we will announce at a later date. It may be a smaller version, but it will be big in spirit-