Lower the United States flag to half staff on Monday May 30th from dawn until noon in observance of Memorial Day. Per the United States Flag Code :

EXCERPT FROM THE US FLAG CODE

Section 7.M
The flag, when flown at half-staff, should be first hoisted to the peak for an instant and then lowered to the half-staff position. The flag should be again raised to the peak before it is lowered for the day. On Memorial Day the flag should be displayed at half-staff until noon only, then raised to the top of the staff.