Here are a few options for descriptions, catering to different levels of detail and emphasis:

**Option 1: Short & Sweet (Good for general use)**

* **Description:** 农历每月初一和十五，指农历月相的开始和满月时，是传统节日习俗的重要日期。 (The first and fifteenth of each lunar month, referring to the beginning and full moon phase. Important dates for traditional holiday customs.)

**Option 2: Slightly more detailed (Highlights cultural significance)**

* **Description:** 「初一十五」指农历每月的初一（朔日，月亮开始新生的日子）和十五（望日，满月之日）。这些日子往往与祭祀、祈福、斋戒等传统习俗相关，在华人社会中具有重要的文化象征意义。 (The “first and fifteenth” refers to the the first (beginning of the lunar month, the new moon) and the fifteenth (full moon). These days are often connected to religious rituals, prayers, fasting, etc., and hold important cultural significance in Chinese society.)

**Option 3: Focus on activities/topics you’ll cover (Good for content categorization)**

* **Description:** 关于「初一十五」的传统习俗、节日活动、饮食文化、以及这些日子背后的文化内涵。 (About the traditional customs, holiday activities, food culture related to the “first and fifteenth,” and the cultural significance behind these dates.)

**Option 4: Simple and Direct**

* **Description:** 农历每月初一和十五。 (The first and fifteenth of each lunar month.)

**Choosing the Right Option:**

* **Consider your Audience:** Are your readers primarily Chinese speakers familiar with the culture, or are they less familiar? Adjust the detail accordingly.
* **Content of Your Blog:** What kind of content is this tag associated with? (e.g., recipes, cultural analysis, event listings?) The description should reflect that.
* **SEO:** If you are concerned about search engine optimization, you might include keywords like “农历” (lunar calendar), “节日” (holiday), “习俗” (customs) in the description, but keep it natural-sounding.

I recommend either **Option 1** as a good general-purpose description, or **Option 3** if you want to indicate what topics you are typically covering. Choose the one that best suits your needs and overall blog strategy. You can also customize these further to suit your specific content.