By Sam Laskaris Writer The Six Nations Rivermen were able to have a little bit of fun in their most recent outing. But it’s expected that it will be all business for the local Senior B club this Saturday in Owen Sound as it finishes off its regular season schedule. The Rivermen will wrap up their Ontario Series Lacrosse (OSL) regular season with a Saturday matinee versus the Owen Sound North Stars. That match, which will be held at the Bayshore Community Centre, has an opening faceoff scheduled for 3 p.m. Six Nations is sitting atop the standings in the six-team OSL sporting a 13-2 record. But the Rivermen will in all likelihood need to register a victory on Saturday to guarantee themselves a first-place finish. That’s because the Brooklin…