[Context] I am an employee in the marketing department of Huaqi Trading. The company held a customer appreciation event on September 19. Below are the rough notes I jotted down; they need to be organized into an event summary for the department manager.
[Task] Based on the notes, write a draft event summary report.
[Requirements]
1. Divide into four parts: Event overview / Main results / Problems / Improvements for next time;
2. Use numbers to make the point, using only numbers that appear in the notes; do not make anything up;
3. Within 800 words, plain tone; do not use clichés like "complete success" or "attached great importance";
4. Information that is not in the notes but should be in the summary: list it at the end as a "To be supplemented" list.

[Notes]
- September 19 (Saturday) 2 to 5 p.m., Banquet Hall on the second floor of Binjiang Hotel
- Invited 60 existing customers; 48 actually attended, 71 people in total
- Program: general manager's speech, new product experience area (standing desks, ergonomic chairs), raffle, buffet dinner
- 12 orders signed on site, totaling about 360,000 yuan; another 9 companies left their intent and are waiting for our quote
- Budget 50,000, actual spend 56,000; the overrun was mainly due to two extra tables added to the dinner at short notice
- Problems: check-in queue was up to 20 minutes; one standing desk in the experience area broke; the microphone had no sound during the raffle, pausing for 5 minutes
- Customer feedback: several companies said the new chairs are comfortable to sit in and want samples to try
- Wanted changes for next time: do QR code check-in in advance; keep one extra sample of each product in the experience area