The "Hello happy house" will have four rooms designed to take visitors on a "journey through differing states of happiness". The rooms include relaxation, fun fair activities and a bounce room.
Laura Jane Williams, a happiness expert and author of Ice Cream for Breakfast, will host happiness workshops and give tips on how to be more playful.
The brand is using the activation to promotes its latest foundation range Hello Happy. The experience runs on 29 and 30 June in London and will travel to Bristol and Cardiff. It is being delivered by The Persuaders.
Benefit Cosmetics’ head of brand activation Kyra White said: "At Benefit we truly believe that laughter is the best cosmetic. The Hello Happy House is the place to go to giggle, relax and generally take an hour out of your day for you. We are a nation of big kids and this is the perfect place to rediscover your inner child."