I agree with the others... it's completely OK to want this, and to talk to your T about this, but she may not be able to give it to you.

I think it might be awkward during the workshop for her to pull your parents aside, even if they know that she's your T, and talk to them about you. It might also risk your confidentiality, since she might be overheard by others.

And if your parents are paying to attend, it could put everyone in a weird role (technically, they're "customers" and they're there for workshop information... having your T break that role to advise them about you could be weird, and make them feel like she didn't do a good job as the workshop leader).

Hopefully your T can help you brainstorm or role play how you can tell them yourself, or determine if it would be necessary/helpful to have a session where they attend for part of it, so that you and her can talk to them, together. That way your T would be there to support you, and help diffuse any arguments that come from them!

Good luck!