Cynthia - those shoes look very nice - looks like a knit spectator. They should be good for everything.
For your daytime shirts, think about using tanks and Ts to wear under the jacket. When I had to do a month in june down at the Westin Hilton Head, this is what i did, as I had to be in a suit for work. Hot as sin in the lobby because the Front Door was always open. I'd wear one for work, then again when I had a couple of hours off, You can always spiff it up a notch with a scarf. Just a suggestion,
This is the Lyon trip, right? Take notes for me for food!!!