Citi is launching something called Citi Shop Day that will run August 5, 12:00 a.m. – August 6, 11:59 p.m. ET. Citi says you will earn 20x points on select merchants. This requires installing the Citi shop browser extension, so it means you won’t be able to stack with other portals. Difficult to know if it will be useful, will depend on the merchants.
