UC Davis' Center for Educational Effectiveness is now offering their ACCELERATE program asynchronously, meaning that it's a self-paced learning experience. I've done the synchronous version, and can say that it's well worth the time investment. As you prepare to teach remotely in the fall, consider spending some time working through the program.
The Global Society of Online Literacy Educators is holding a series of walk-in webinars this coming week (Mar 23-27). These will be on a variety of topics, led by experts in online instruction.