The term "bf" can refer to different things, but based on the context of your query "when is bf," here are two relevant interpretations and their answers:

1. If you meant Battlefield (often abbreviated as BF) referring to the Battlefield 6 game:
   • The open beta for Battlefield 6 was held on two weekends in August 2025:
     • Weekend 1: August 9-10
     • Weekend 2: August 14-17
   • The beta ended on August 18, 2025.
   • The full release of Battlefield 6 is scheduled for October 10, 2025.

2. If you meant "bf" as in "boyfriend," the special day known as National Boyfriend Day is celebrated on October 3rd each year.

Let me know if you meant something different by "bf"!