（注：以下为符合要求的英语作文，实际写作时需注意段落间的逻辑衔接和过渡词使用）

The most unforgettable experience I had last month was organizing our class's charity sale. This event not only raised over 800 yuan for the children's hospital but also taught me valuable lessons about teamwork and responsibility.

The idea for the charity sale came from our English teacher's suggestion after learning about volunteer activities in our textbook. During the first class meeting discussing the topic, I noticed many classmates showed strong enthusiasm. We decided to divide tasks based on individual strengths: responsible students like me would manage budgeting and scheduling, creative ones designed posters, while organized members collected donations from teachers and parents.

The preparation process was full of challenges. Initially, we struggled with finding affordable materials. Through group discussions, we realized making DIY items could save costs. For example, our art classmate Lily created beautiful paper flowers using recycled materials. Another problem was attracting customers. We solved this by setting up interactive games like "Word Translation Relay" where players had to correctly translate Chinese idioms into English. This not only engaged passersby but also improved our language skills.

On the actual day, we transformed our school corridor into a vibrant market. Each student had a booth displaying their handmade crafts or donated goods. I particularly remember our class's "Book Crossword" game which combined reading comprehension with charity donations. When a kind old lady donated 200 yuan after solving ten puzzles, her words "Every small effort counts" deeply moved us.

However, unexpected issues did arise. Halfway through the event, a sudden rainstorm threatened to cancel the sale. Instead of panicking, our class quickly moved all tables indoors and set up a temporary shelter. We even extended operating hours until 5 PM to compensate for the inconvenience. This experience taught me how important flexibility and quick thinking are in real-life situations.

Looking back, this project was more meaningful than just raising money. Through weekly progress reports, we learned budget management skills. Our teamwork improved as we held daily meetings to share updates. Most importantly, we formed a stronger bond by helping each other overcome individual challenges. The best part was seeing our efforts come to life – the hospital staff later sent us a thank-you letter with photos of children playing with the donated toys.

This experience has completely changed my understanding of "charity." I now realize that kindness doesn't require grand gestures. Whether it's helping a classmate with homework or making small donations, every positive action contributes to making our world better. As we say in our English club: "Small drops make big rivers." I will definitely participate in more social activities because they help us grow both personally and socially.

（全文共5个自然段，不含开头段和结尾段共4段，实际写作时可根据需要合并段落。全文通过具体事例展示项目筹备、执行、问题解决和收获感悟，符合六年级学生认知水平，包含时间顺序、因果逻辑和情感变化。实际使用时需注意保持时态一致性，建议补充具体数据细节以增强真实性。）