Better get one.

else
1. you don't know what to do or prepare
2. drinking tea become some boring as there are no "Voice over" "commentary" when it's going on
3. You don't know the arrangement or sequence of who to drink tea first.
4. Yum Seng session becomes super boring and meaningless

Seriously, some things really cannot kedekut one. it's like trying to run an event without a proper host or emcee.