can one do power meditation ,yoga and all such stuffs during periods ..Vibrations are actually very powerful ..can manthra vibration or runic vibration be done during periods?

Yes of course! It is even more powerful then as women are at the height of their vril or witchpower right before and on their cycle.

Yes, you can. I have always done these things during my periods and never had a problem.

You might want to avoid inverted yoga asanas during the period, but some women have no problem with them.

Otherwise, yes, as stated already by other members.