How can I require a minimum number of participants for a booking in WooCommerce, while allowing customers to choose any mix of participant types (like adults and students)?

You can achieve this using the Bookings and Appointments for WooCommerce plugin, which allows you to define both participant types and overall booking limits.

With the plugin, you can:

• Create multiple participant types (for example, Adults and Students).
• Set a minimum total participant requirement (such as 10 participants).
• Define the maximum total participant limit (e.g., 30 participants).

Customers can then select any combination of participant types as long as the total number falls within the minimum and maximum limits you’ve defined. For example, they could book 1 adult and 9 students, or 6 adults and 4 students, provided the total meets your required range.