Module 4 lesson 4 - 8 ways to scale part 1

I don't have a suite yet but have some ideas - I am a personal trainer and nutrition coach.  By title I am in coaching but was thinking a one day training event could be a good way to build clients.  Should that event have a cost attached or can I do it for free?  

I know my time is worth $$ but was thinking the long term may be more beneficial to have it free and work to gain the clients at the event.