The reversed Three of Cups indicates a worrying situation, where the person is disconnected from their emotions and relationships. This can mean that people are not open to new relationships, or that they are afraid to get involved. Furthermore, this card can also indicate that the person needs to take some alone time to process some feelings before entering a relationship.
The Eight of Wands is about a challenge that leads to evolution. This challenge may indicate that we need to step out of our comfort zone and explore new ways to meet someone. It could also mean that we need to learn how to open up to others and build more meaningful relationships.
From reading the cards, it appears that the chances of meeting one's future partner in a leisure activity such as the cinema or theater are limited. With the Three of Cups reversed, it seems people aren't open enough to embark on a relationship, and the Eight of Wands indicates that we need to do some internal work before we can build meaningful relationships with others. Therefore, the most likely answer to the question is: Theater, as it is more suitable for working on oneself and discovering how to build deeper relationships.