Hmmm. I think I'd give him an open invitation, and if he didn't respond or was flakey about it, I'd leave it up to him to respond or invite you to hang out.

As you bought him the blender and were thinking in general of alcohol as well, perhaps send him a Facebook message of something like "Being that you have that nice new blender, I found a nice recipe for [sangria/some other alcoholic drink that involves blending things] that we could use to break it in. Interested?"