The LEGO City Seasonal theme (Advent Calendars) are annual LEGO sets released offering a countdown to Christmas. Each set includes 24 small builds, one to be opened and assembled each day from December 1st to December 24th. The calendars typically feature minifigures, tiny vehicles, and festive-themed items, providing a daily LEGO surprise in the lead-up to Christmas.
2009 LEGO Sets
In 2009, LEGO Star Wars celebrated its 10th Anniversary with the release of its 10th Anniversary sets. But even more important, LEGO celebrated its 50th anniversary of the LEGO Brick. A number of new themes were first introduced including BIONICLE Glatorian, Space Police III, Power Miners, Agents 2.0 and LEGO Pirates was re-introduced. Some themes that were retired in 2009 by LEGO included Mars Mission, the original and highly collectable Batman sets. Exo-Force and Belville where also discontinued in 2009.