Still seems kind of small to me to call it an expo. Looks better than imagining just a store front though. Not sure what it would be called other than an expo, but expo gives the impression its going to be very large. Oh well, its neat that you want to organize an event like that either way.
Potential funders may be put off by the lack of details though. I didn't see any date, or guest list, whether it is one day or multiple, etc. The free admission sounds nice. If you could get a few recognisable names to be in on it that would go a long way. A local game studio, or known artist, something like that.