Brooklyn Millennium: you DO NOT need to register for their in person open houses. You DO need to register for them zoom meeting. Link for that to come in October: https://www.millenniumbrooklynhs.org/apps/news/show_news.jsp?REC_ID=871592&id=0

From their website: 

MBHS will hold two in-person Open Houses (10/8, 10/26) and one Zoom Open House (10/22). Registration is NOT required for the in-person orientations on 10/8 (6:30 - 8:00 PM) and 10/26 (10:00 - 11:30 AM). Registration is REQUIRED for the Zoom Open House on 10/22 (NOTE - registration information will be shared in October). Please see the "Calendar" tab for more details and/or to register for the 10/22 Zoom Open House in October. Note that for all three events, seating is limited and on a first come, first served basis!