I don't know if Shugden practitioners were allowed or if any would want to even go if allowed... However check this out and listen to
Great Stages of the Path (Lam Rim) Commentaries - Session 5 http://new.livestream.com/DalaiLama/lamrim-english from 01:01:00 onwards what HHDL is saying about His Nyingma practice, and about His Dorje Shugden practice. HH mentioned He did not simple just stop the practice based on a whim but actually did a doh ball divination in front of Avalokiteshvara statue. He also mentioned when the divination came yes to stop DS practice immediately, he got news from Trijang Rinpoche that Palden Lhamo was upset but says He will not go in to details on this! I wonder why was Palden Lhamo so upset about!
The basis of HH entire speech was we cannot be "sectarian" and cause "discrimination" on to other Vajrayana traditions, and HH felt bad He could not attend to some people who have requested Him for help because they were from other traditions.... This sounds really weird, would could he not attend to them? Did Tsongkhapa say you can only help those in Gelug tradition? I never heard of this nonsense at all! The whole thing felt like a huge excuse, or a cover up using "sectarianism" as the main point of why Dorje Shugden practice is not good when this is obvious not the case because even Dorje Shugden himself has helped many people in different traditions before. If there was a political rift and sectarianism between people in different traditions, it is the people who should be corrected and not the practice of an entire lineage. Besides what is so wrong if some of us wishes to just stick with our own lineage and master it? We can't even master 1, why do we need to study another for?
If HHDL decides He wants to study another tradition and got the approval from His teachers, then that is fine, and not a problem, why make all Dorje Shugden practitioners' issue??? As HH mentioned Je Tsongkhapa himself studied from all the other schools and condensed the essence of each tradition in to what we call Gelug, shows clearly Gelug tradition is from and hence not sectarian. So that means Dorje Shugden is literally the protector of all traditions, protecting the purest and the best teachings from all traditions which is found in the Gelug. Hence what's the PROBLEM?
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If people do not wish to learn from another teacher in another tradition, let them be. If they want to and their Guru permits, so be it... trust in one's Guru to know if you can or cannot handle it. If the Guru says NO, you cannot learn from another tradition and pollute our tradition, perhaps the Guru can see right through you that you will end up mixed up and instead of the teachings benefiting you, it may bring you harm or confuse you even more. That is why we have a Guru to guide us, no? If you do not agree with your Guru and wish to challenge His decision, then why on earth have a Guru in the first place, you are right and you know it all then. It's not that the Guru is sectarian, it's because the Guru wishes to protect your mind!
So for those so called "Gelugpas" who caused trouble and created actions that are not Dharmic or disrespectful to other traditions, we can question them, discipline them and help them stop discrimination and quietly do their practice instead of just dismissing a protector's practice of over 300 years that has brought benefit to many. That's stereotyping and banning the practice, this itself is being sectarian and discrimination! Why can't those who wish to remain "pure" in their lineage be left to do so peacefully? Why so much drama? Not everyone needs to follow HHDL decision and choices, why impose your views on to others by force? Sounds off and like a huge cover up... it's like the pot calling the kettle black!