Namaste
In 2011 in Banglapore India there was a huge congregational chanting of the Vishnu Sahasranama, involving multiple Vaishnav communities, and all were welcome as well, no restrictions.
I know for a fact that the Sri Vishnu Sahasranam as found in the Mahabharata, Anusasana Parva, Section 149, verses 14 to 120, is chanted regularly by Vaishnavs in homes including by women. So my observation is sects who restrict women are a minority. For some it is every day, for others then on days of an eclipse to mitigate effects of planets and other times. In MANY Sanskrit courses here in California, students are asked to learn by heart the Vishnu Saharanama as part of beginning Sanskrit studies.
By the way, for anyone in the Bay Area of California, there are Vishnu Sahasranama classes in the Bay Area at the Sanatan Dharma Kendra in Sunnyvale, California, typically starting at 7:30pm. Here is there link if you are interested in attending:
http://www.sanatandharmakendra.org/
In fact there is one today (May 5, 2014 at 730pm) "Vishnu Sahasranamam chanting class", all are welcome, children, adults, men and women.
There are others also if live in the Bay Area as I do, for example there are Bay Area contacts of the Datta Yoga Hanuman Temple (where Sri Vishnu Sahasranama Sloka learning courses started in January of this year 2014) that also have instruction.
Om Namah Sivaya
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