Social
Networking event chat
Make small talk with a fellow attendee at a professional networking event.
What makes this one hard
The opening and the exit are harder than the middle: starting with a stranger, and then leaving without seeming to escape. English has set moves for both, and the "what do you do" loop is a script you can prepare once and reuse all evening.
Practice every scenario with a real AI partner
Free to start. The partner reacts in voice, stays in role, and gives feedback on what you said and what you could have said better.