How to do marketing in such a industry where traditional vendors and methods are used ?

I have been working in event tech industry where people can plan their event , book vendors and make a full plan and ecosystem for events across whole year with all the things needed embedded in a single platform .
The pain point is that this industry runs through too much word of mouth and traditional ways , people call their fixed vendors and they handle that .
So how to do affective marketing in such case with better results and good ROI?