S.F.
Hi M.!
I don't allow tv during the week and limit it to a few hours each day on weekends. But, if my sons don't behave or do their chores properly, they lose the privilege.
As for play dates, I schedule them when they're convenient for me and my family...which isn't often. If you're not comfortable with your child at other folks' homes, then invite the kid to your house. If that doesn't work, schedule a play date at neutral territory, like a local park. Plus, play dates are dependent on good grades and behavior at school and at home. I've cancelled more play dates than I can count because my kids couldn't pull that one off.
I believe that family comes first. If a play date is disruptive to the family, then by all means, decline. If someone is rude enough to question your choices, be polite but honest about your concerns. A gracious parent will do all they can to dispel your concerns, such as invite you and your kids over for a "family" play date or simply accept your limits. A rude parent will show their true colors and you can act accordingly.
You may not be the most "popular" mom for this stance, but as we all learned in high school, what's right isn't always popular! Find your limits and stick with them. If other folks can't handle your limits, too bad for them.
Good luck!