All about me bag - Each child fills the bag with 4 things about them and brings it into school. They can decorate the bag too. I did this with my own items as a first day of school ice breaker. Maybe get large paper sacks from the grocery
This infographic is a great summary of working memory, which is defined in chapter It discusses the process, facts about it, and strategies for teachers related to working memory. It mentions mnemonics and chunking as strategies related to working memory.