I'd also like to add my two cents into the conversation... I would love to see such venues like- recording studio, acting academy, and an awards theater with red carpet, paparazzi, and fashion police NPCs. Maybe a new feature on the TV- "Watch Awards Ceremony LIVE". It would happen randomly when you click on the TV your Sim could watch the show from the comforts of their living room. If your Sim is a celebrity on the red carpet you had interactions like- "sign autographs, pose for paparazzi, interview with celeb media, give award speech (if your Sim won an award in the career branch to receive promotions and advance further in their career). New party event for celebrities where our Sims got to meet other celebs, film directors, record producers, etc. to gain celeb points to also advance further in their career.
As for fashion- I feel it should be its own game pack with two interactive career branches "Fashion Career"- Model/Fashion Designer. A new venue would be a modeling agency. The fashion designers styled their own fashions in their own studio at home. And have pop-up runway shows that took place in the community park that our sims who were models had to attend, or if our sims who were designers held to showcase their fashions.