A little bit of calculation. From lvl 0 to lvl 20 you need about 328 hours.
At this moment, i'm lvl 14, 32.0 pleasure. To reach lvl 20 i still need 159 hours, or 6.62 days, but event ends in 6.3 days.
So i need about 0.35 days or 55 pleasure. At lvl 19 when you buy energy for rubies you will gain 0.8 pleasure per ruby.
So i have 2 option
1) buy energy refill 2 times and reach lvl 20. It means I will buy multiplyers with 33% discount right now. But next time, when this event will come, there will be nothing to do, and in a long run i just lose rubies.
2) wait until next "Private show: Alexis" event, where i will guaranteed obtain lvl 20 shortly after the event start. No multiplyers right now, but win situation in future.

Probably 1st option for me looks better right now. What do you think?

Anyone who wants to count hours required for your current game to reach lvl 20, can use my little spreadsheet. You can edit only yellow cell.
docs.google. com/spreadsheets/d/1JX2cyxr0s-0fUnphDZhGGn0sWjQ22CUDUwFVupPpvtw