DIY Blog Tour: Confirmation
Once you've received responses from everyone, set concrete dates for each tour host and respond to everyone giving them their date and confirming the content of their tour spot. This one time, it's okay to send a mass email. Ask each host to let you know if there are any errors or if they need to change their date/content.
You don't have to send the actual content yet unless you're crunched for time. Keep in mind you want to send it early enough to give your host time to upload it, but not so far in advance the information gets lost in their inbox weeks before they need it.
Now is a good time to provide them with the link for the host page so they know where to find more information if they need it.