This is interesting, but not interesting enough. Not yet. You need to work further on your branding. What KIND of promotion for artists & designers? How is what you do DIFFERENT from anything else? What do artists & designers GET from you that they don't get anywhere else?

Your target market are social creatures. Are there withdrawn, shy artists? Of course. But most either want to meet other people, or are aware they must meet new people to promote their work. So some kind of party is what I recommend. Start thinking about how you can accomplish this virtually, online. A red carpet event, a premier event, a good old-fashioned mixer. It cannot be just about you; somehow, you have to build in a way for the participants to mingle and do what you say your brand allows them to do: promote their work.

Facebook ads can help you attract the right people. The question is, what are you attracting them to; why should they be in the room?

Where do artists and designers hang out? Online and offline? Where can you get in front of them that they already congregate at?

Your brand needs a shot of panache and a big reason for artists & designers to be attracted to it. The ability to promote their stuff is great, but they have to see for themselves how it affects them personally. That's how to get their involvement. And you want them talking about it--before you have this event. Get them to build the buzz, because they will do a much bigger and better job about it than you can.

In fact, go out and find celebrity spokespeople to shoot quick videos about why they're supporting your brand. What they're getting out of it. These don't have to be world-striding celebs: local will do. But begin. You can build on these. Show user adoption. Excitement from the target market. Narrow down on their reason for being in the room.