Steam Game Festival: Summer Edition Postponed

Valve announces that The Steam Game Festival: Summer Edition is postponed by a week, and will now start on June 16th instead of June 9th as was originally planned. Many of the recent game event postponements have cited ongoing civil unrest and the Black Lives Matter movement as causes, but this terse announcement does not go into reasons, saying simply:
The Steam Game Festival has been rescheduled for Tuesday, June 16th thru June 22nd.