I think that hitting forearms indirctly is more building then hitting forearms dirctly. in other words, i think trainng with no straps is better then doing wrist curls. but if you really want to hit forearms do hammer curls across the body and reverse bb curls.
for calves all you should need is standing and seated calf raise. if you gym doesn't have a standing calf raise do the toe press on a leg press. just 3-4 sets each and use different ways to shock the muscles. pre exhaus, superset, drip sets adn etc... try the triple drop sets on a calf raise. and you feel it.
I think calves should be hit once a week. if you hitting it hard enough. theres no need to hit 'em again