I would strongly urge that June is too soon to start having WCA competitions again, especially not in countries that haven't been doing widespread testing and whose covid-19 cases are still significant.
Infection risk is primary determined by the degree of exposure multiplied by time, and so having a group of people (a good bulk of whom are kids) in a confined space for an entire day is especially dangerous. Some of the most significant recorded outbreaks have occurred during events that involve lots of talking, yelling, singing, etc, especially louder venues which require speaking loudly, (think sporting events, choirs, family reunions) because a) they take place within confined spaces where viral particles can hang in the air, and b) talking loudly (or just talking at all) releases a good degree of viral particles. Then there's the extra degree of contact - transmission through surfaces like cubes, solving stations, chairs, entrances/exits to the venue, shared venue bathrooms*, and stackmat timers. All of this compounded over an entire day poses a significant risk. Even social distancing measures fail to eliminate the risk posed by people circulating through the same air that viral particles have been released into.
Another thing to consider: Part of the reason the virus spread so quickly is because there's evidence of a high rate of asymptomatic transmission, i.e. people who don't show symptoms (and never do) can still transmit the virus. And based on how my college friends (in NY state of all places, which has more cases than any other
country) have been handling the pandemic, I think it's safe to say that the average age group that attends cubing competitions won't take safety measures super seriously.
The point is, no matter how safe we try to be, the nature of cubing comps - a large number of shared surfaces, being in a confined space for an entire day, lots of conversation, kids who may not think about the risks objectively, etc - pose significant risks. The Spanish flu of the late 1910s infected and killed more people in its second wave than in the first precisely because people thought it was safe to return to business as usual.
*toilet flushes have been known to aerosolize many, many droplets, and there's evidence that the virus can be transmitted through fecal matter
Many of the things I've mentioned are discussed in this article:
https://www.erinbromage.com/post/th...KrBsAmKpXuL7qNMbPAndFngdytTTp7VDzInIQNnDO4Xio