For folkstyle... www.ohiowrestler.com
He does a great job of listing tournaments although not all tournaments pay for the advertising. You can also find similar sites for West Virginia and PA by googling them.
www.themat.com *(I think) is the site to check for USA events -- some are folkstyle, others are freestyle or greco... USA card required for these and they'll be happy to sell you one.
You can also google and find the AAU site to get a list of AAU tournaments by region.
Seems like there are tons of tournaments every weekend from now until the end of April, then Wrestle for Autism, then nothing else is advertised... yet. But more tournaments are added quickly. Keep checking ohio wrestler.
Great info Hizzmuther. Don't forget Tournament of Champions on April 24th.