Couples across China are rushing to tie the knot on Wednesday and Thursday — May 20 and May 21 — two dates that sound like "I love you" when said aloud in Mandarin, with marriage registration slots fully booked weeks in advance in several major cities.

In Chinese, "520" is pronounced similarly to the Mandarin equivalent of "I love you", making May 20 a sought-after day for registering marriages. The following day, May 21 — or "521" — carries a similar meaning, offering a popular and much-needed alternative.

All slots in the 15 marriage registration offices in Guangzhou, Guangdong province, were fully booked for May 20 by the first week of this month, as they were in Shen-zhen. In Nanjing, Jiangsu province, more than 1,400 couples had reserved May 20 as their chosen date by late April, with scenic registration sites such as the Confucius Temple already at capacity. Some locations were fully booked for May 21 as well.

Wuxi, another city in Jiangsu, has no online slots left for May 20, though local authorities said that couples could still register as walk-ins.

For one Beijing-based couple, securing a May 20 slot required a midnight digital scramble. Guo Xiangyu, 30, a doctoral student from Xi'an in Shaanxi province, and Yan Xin, 34, an internet worker from Baoji, also in Shaanxi, booked their appointment two weeks in advance. The couple and both sets of parents logged into the system at midnight across PCs and mobile devices, and Yan managed to secure a slot. "We expected it to be crowded, so we feel very lucky," she said.

In preparation, the couple had completed free premarital medical checks at a Beijing hospital, taken registration photos at a commercial studio and hired a photographer to document their special day near the civil affairs bureau.

The pair met via social media, bonding over photography and skiing, and dated for two-and-a-half years before deciding to marry. They chose May 20 partly because its homophone "520" is a declaration of love in Chinese and is often seen as a Valentine's Day equivalent. "We want to celebrate our anniversary and 520 together," Yan said.

Both originally from Shaanxi but living in Beijing for work and study, the couple benefited from a revised marriage regulation introduced in May 2025. The rule ended a decades-old restriction that required people to register their marriage in a place where either spouse's household registration was recorded. Now, couples can marry anywhere in the country without presenting their household registration booklet. "It saved us time and travel costs, and made us feel more connected to Beijing," Guo said.

Thursday or May 21 is the choice of many this year as it coincides with xiao man, or Grain Buds, a traditional Chinese solar term. Song Jian, an engineer from Sichuan province, chose this date over May 20. "The solar term carries a beautiful saying — a modest half-full state is better than perfection," he said. "That fits our relationship well. You don't have to pursue perfection in life; being content with what you have is enough."

Multiple provincial-level regions have also organized mass wedding ceremonies on and around the two dates to promote simple ceremonies.

In Hainan province, collective weddings will be held on Wednesday at coastal venues, including Coconut Dream Corridor in Sanya and the Wenchang Spacecraft Launch Site. Zhejiang province hosted a ceremony on Saturday featuring 520 couples, with a main venue in Hangzhou linked to dozens of sub-venues across the province. Guangdong organized military-civilian collective weddings in Guangzhou on Monday, Zhaoqing on Sunday, Foshan on Friday and Zhongshan on Saturday, involving more than 1,000 couples.

"This collective wedding is a celebration that's both sweet and green, without the complicated preparations," one groom, Zhong Zhiyuan, who was part of the Guangzhou weddings, was quoted by the local media as saying.

But not everyone is keen on getting married on popular dates. Yang Xinran, a marketing professional from the Chinese mainland who now works in the Hong Kong Special Administrative Region, registered her marriage in Beijing last September and deliberately avoided peak days. "As working people, we have to prioritize our schedules," she said.

Yang and her husband picked several possible dates based on their work calendars, then let their parents make the final call. "Even booking a restaurant for an anniversary is hard enough on popular dates — no need to add to the trouble," she said.

In the past year, authorities processed more than 682,000 interprovincial marriages, official data showed. China saw a significant surge in marriage registrations in 2025, with 6.763 million couples registering, a 10.76 percent year-on-year increase.