Just because I had a few ideas...
that could be implemented to the game...
Here they are:
1-) Guerrilla Gigs. Loads of artists do them nowadays. They could work as a fame boost for the city, pretty much as "almost free" ad. The fame raise would be proportional to the previous fame, the quality of the show and equipments used.
2-) House Party As a way to boost relationships between people and including between people that attend to the same party. You could maybe set a "Schedule House Party" at your home, and then invite people from your relationship list (would work pretty much as a "group date"). Whoever throws the party could buy drinks and food - enough for all guests. The thrower could get also a mood boost