Do you want to get Calibre running
on the tablet or do you want to connect the tablet to Calibre?
In the first case, you're out of luck- there's no Calibre application for Android and, as far as I know, no plans to do a port (there's even some debate as to whether or not that can be done with the current hardware).
In the second case, did you try to just plug it in while Calibre is running? Note that the tablet needs to attach as an USB mass storage device in order for Calibre to detect it. If it is connecting as a mass storage device and Calibre doesn't recognize it, see
this FAQ entry or use the user-defined device interface plugin.