Every year, the British Science Association coordinates a multi-day STEM celebration, with activities and events taking place across the UK. Educators around the world may enjoy the classroom materials curated as part of the event. Made available with support from UK Research and Innovation (UKRI), Mewburn Ellis, and 3M, these activity packs center on the theme "Innovating for the future," and contain a bevy of ideas to get students stoked about STEM fields. Plus, this year's materials were designed for use in classrooms or virtual learning settings. Three activity packs are available, categorized by age: Early Years, Primary, and Secondary. Additionally, previous materials (2017-present) and associated activity packs created by partner organizations are linked at the bottom of the page (for example, one partner created STEM activity ideas for physical education classrooms). Educators who use any of the British Science Week materials are encouraged to share their STEM success on Twitter with the hashtag #BSW21.