does anyone care?

A group of us are planning a Christian workshop tomorrow re radio and internet use. 4 people have paid. a few more have said they plan to come. we have no sure number to order meals. We wonder if expenses will be covered. One speaker had to cancel this evening. Sometimes I wonder if this matters, if it is worth it, when so few act interested or make the effort to come. Should we continue? In God's work and even in other areas of service one often hears "even one person helped makes it worth while". Yet to what extent should one ask whether there are other areas where one's efforts would be better spent?
I wonder what speakers think when they work so hard to prepare a presentation and a handful of people show up.
Yes, Scripture teaches us to keep sowing, keep praying, keep plodding. The mustard seeds grow into trees. May the Lord water my mustard seed and those of people who attend and say "I want to do that" (internet evangelism, radio via internet, etc.) and leave more convinced than ever.
Margie