For now there are several locations in Europe that have opened registration for the December test. Off the top of my head, I think Düseeldorf and Frankfurt, Bordeaux and Paris, Vienna, Dublin(?) are among those that have. Of course, they could always be forced to cancel again.
You can check the jlpt website for links to specific sites. Check those sites for the latest information, because the jlpt website might not be entirely up to date.
Have a look at the ~ JLPT 2020 ~ thread to keep track of any developments.