How can I tell my FLAKEY friends that I'm pissed off?

I hosted a neighborhood wickless candle party yesterday. I passed out flyers in my entire neighborhood, made signs (like someone would for garage sale), and invited about 10 people that I know. The only two people that showed up were my mother and sister in law. The only reason they came was because my husband called them and made them (you could tell by their demeanor). I can deal with the fact people in my neighborhood may not come because they don’t know me however; it is unacceptable to me that none of my friends showed up. I want to post something on FB or something saying how disappointed I am but I’m not sure what to say. Can you please give me advice on what to say to these people who I “thought” were my friends?