No. We don’t send reservations to the hotel until late February. If you call the hotel before then, they won’t have your reservation on file. Additionally, hotel staff is instructed to send you back to SXSW Housing to make your changes online.
The only exception is changes made within 72 hours of check in. To ensure the hotel receives last minute changes to your reservation and you don’t have trouble checking in, it is best to make those changes online and to ALSO call your hotel to alert them of the change. Especially if you won’t be checking in on your reserved check in date or are arriving very late.
You can easily make changes online from your reservation confirmation email, your SXSW shopping cart, or your SXsocial account.