InfoCommerce 2007 will be held at the Park Hyatt from September 24 through the 26th. The same group will also stage a conference called HealthContent 2007 on the 24th, also at the Park Hyatt. Not sure about seating available for the conference, although I believe there is also an exhibit hall.
The 6th RFID, Barcoding & Emerging Technologies for Hospitals and Health Systems (that's a mouthful) will be held at the Hub Cira Centre in Philadelphia from September 24-26. It's obviously a major topic of interest to many in the Philadelphia area.