BlueHost has notified me that my account is on a server undergoing migration to new hardware at approximately:

11PM MDT Friday June 10th

We expect the downtime for the account to be 1-2 hours, but could be
completed long before that window.  DNS issues including DNS propagation
will not be an issue with these migrations as all the IPs from the
original server will be moved to the new server as part of the migration.
This upgrade should greatly increase performance for your account.
We apologize for any inconvenience.

Ideally, none of us will notice, but I always appreciate them letting me know, and I feel it’s appropriate to pass the word along to you.