LibreOffice community is now preparing for the major release of LibreOffice 3.5.0 which will be released next year. For that event, they wanted to make sure that every bug has been fixed before it reached the users. For that reason, they will held a Bug Hunting Session which will be started at December 28 and 29, live from five different continents around the globe.
What can you do? You can help them by downloading the pre-release of LibreOffice from their download page, and then start using it and report any problem you encountered during normal usage. Every information you posted will be a valuable report to the developer to diagnose and fix the problem.
For those who are curious about what will the next major release be, you can visit LibreOffice 3.5.0 Release Note (in Draft).