Don't worry about just showing up. Unless there's a major match coming up, practice is largely pretty casual.
Just don't expect an offer of sponsorship the first time you come. Like Editor and ILikeGlocks said, we only have two sponsorships a year and making the referral, if it turns out...
Don't just observe. Come and shoot. Now that the weather is better and the sun goes down later there's more time.
Except tonight. Tonight we're closed for paving. There will be a few of us around doing other stuff so feel free to stop by.