Here are a few other options to consider:

1. If you want to stay at the Charles, you may be able to find someone who already has a reservation and is looking for a roommate. Roommate matching is taking place on CrowdVine. 

2. This google map shows the Charles Hotel and the symposium venue (Wasserstein Casperson Clinical aka WCC). As you look for options, consider adding the addresses of potential hotels to this map by clicking "add destination". This will allow you to see where a given hotel is in relation to the main symposium sites.

3. Hotels.com had several good options (including the Marriott Courtyard for $169) at the time of this writing. Enter the city as Cambridge, MA then be sure to then narrow selections by neighborhood (Cambridge) otherwise many out of area options will be shown.

4. A number of people are staying at the Irving House. This bed and breakfast appears to be booked but a note on their site says to call as they may have something available.

[edit 5/25/2012: we are now maintaining a waitlist]

[edit: see above note regarding the waitlist]   

I don't do twitter or facebook. Please text me or email me if a ticket becomes available.
As a completely volunteer run organization, individual calls, emails or texts are not possible. Notifications for blog posts are sent via email, so that may be your best option.

Can I register for one day of the conference instead of all 3 days?
Only the full 3-day conference registration is (was) available. In future years we may consider offering one day registration depending on the size of the venue.