Before going into the museum do they bless you?

No. You sign a waiver and are responsible for your own "state" going in.

Yeah no blessings.

I took some sage with me to bless myself before and after

Shellie is correct.

Yes the had sage for smudging...

They do not do a blessing and a waiver is signed, but they do offer things to buy that you can use to clear negative energy, like sage.