Though it has been almost a year since all of the Disneyland Theme Parks closed due to COVID-19 in Spring 2020, it looks like under California's new guidelines, these parks will finally be able to reopen next month. Disney CEO Bob Chapek released the following statement in regards to reopening: 

Here in California, we're encouraged by the positive trends we're seeing and we're hopeful they'll continue to improve and we'll be able to reopen our Parks to guests with limited capacity by late April -- we look forward to publicizing an opening date in the coming weeks. While last week's announcement stated that theme parks may open starting on April 1, the fact is it will take some time to get them ready for our guests - this includes recalling more than 10,000 furloughed Cast and retraining them to be able to operate according to the State of California's new requirements. I am pleased to say the response has been great thus far, our Cast Members are excited to get back to work. And this is also good news for the Anaheim community, which depends on Disneyland for jobs and business generated by visitors.

Prior to the full reopening of the theme parks, Disney will be hosting several "Touch of Disney" events at Disney California Adventure, which you can read more about here. 

And though Avengers Campus is basically finished, it looks like Disney will be waiting a little while to open this brand new area, as they have confirmed that this Marvel-themed land will not open with Disney California Adventure, instead saying that they will be waiting until later in 2021 for this land's debut. You can read more about the new WEB SLINGERS: A Spider-Man Adventure attraction that will debut with this new land here.