Free fashion shows in Galeries Lafayette every Friday at 3PM on the 7th floor of the main Haussmann store in the Salon Opéra (take the escalator Mogador, main building), presented by a team of 6 professional models who show off the latest trends by the most famous designer and couturier collections.
Ancient Roman theater - Arenes de Lutece - built in the 1st century AD and being one of two important remains from Gallo-Roman period in Paris is hidden in the middle of apartment buildings of 5th arrondissement. Not so easy to find, so even more exciting to see.
On Mondays, from 6:30 pm to 8:00 pm, Grand Palais invites you to attend public lectures and debates on a wide range of topical cultural themes. Entrance free with advance booking (limited seating capacity) at firstname.lastname@example.org. Check program here.