There will not be a grand opening. My best "guess" as to how this plays out in general: by June 1, most of the stay at home orders will be lifted, non-essential businesses will be permitted to re-open, with strong recommendations for continuation of social distancing/use of masks. Bars and restaurants, fitness centers/gyms- it will vary from place to place, but they will gradually be opening up through June, likely with some limitations for a period of time. I imagine the NFL will find a way to make the season happen, maybe shortened and with no or a limited amount of fans in attendance. I have given up on the idea that widespread testing will be available, as this administration shows little interest in committing to make it happen. So we likely get to see how things go in the weeks/months that follow with continued limited testing/contact tracing. Let nature take its course! Hopefully we have some big ass early summer heat wave, and maybe that will help suppress it.
I might be completely wrong on all of this, but given the more optimistic projections and the economic hardship imposed on many, it is difficult to imagine keeping things "locked" down into mid summer.