OSMGeoWeek is a great time to expand your mapping skills or even start validating. Here are some resources to further build your OpenStreetMap contribution skills.
Validation is an important part of the Missing Maps process. Getting a second, third, or fourth pair of eyes on mapped features goes a long way in ensuring the quality of data being added to OpenStreetMap and being used in vulnerable communities around the world. Validating requires confidence in your mapping abilities as well as the willingness to help coach and advise newer mappers.