Calendar is easy to answer. Just make sure it is syncing with your google account via settings>accounts & sync>google>accounts(touch the account) & check calendar is checked.
To sync photos to dropbox enter the dropbox app then menu>settings. Ensure there is a prompt which says "Unlink device from Dropbox". Dont touch if there is as it will unlink it otherwise press there to link. Then under camera upload make sure the prompt says "Turn Off Camera Upload" if it says "turn on Camera upload" then you need to press it.
You will find your photos in the new "Camera Uploads" file.