As a seed stage investor (13 deals in the last 12 months) I'm happy to tell you it is easier than ever before to meet seed stage investors. Here are a few ways:
1) conect with founders in your city who have been funded. Ask for their advice. Impress them and let them introduce you to their investor.
2) apply to an accelerator (eg techstars) and nail it on demo day. The audience is filled with seed stage investors.
3) attend an event featuring the seed investors and ask for their advice after the show. Requests for advice are a great way to showcase your venture.
4) kickstart your project. Raise funds and engage early customers. Nothing impresses as much as sales and users.
5) leverage clarity, LinkedIn and product hunt.
6) use the same service providers (eg lawyers, accountants) ask them for an intro.
7) find out where their funds originate from and ask those LPs for an intro.
8) apply to present to your local angel group.
If I look at the deals we've done this year. 80 percent come from the channels above. Until then -- bootstrap it.
The best way is to approach founders of companies backed by the investors you want to meet. Find the founders you think you'll get along with and who will get excited about your product and build a relationship with them.
Get them to make the intros on your behalf if they have conviction in what you're doing
As time continues to move forward, and more and more interest is being placed into the new open-spaces potentially created by the Jobs Act --- there are an amble stream of new tools to generate investor interest, amongst them: Clarity, AngelList, Gust, and the various equity crowdfunding platforms which specialize in niche sectors.
Right now, these are great places to start making your presence known, and truly are indicators of a growing commitment to the overall entrepreneurial community.
Simply put, keep doing what you're doing in this post itself ;)