Golden Week is a Japanese national holiday (based around a number of national holidays) that take place at the end of April / early May each year. This year Golden Week has been extended to 10 days in honour of the succession of a new Emperor starting on Saturday 27 April 2019. This has resulted in the Tokyo Stock Exchange being closed for 6 days from Monday 29 April 2019 to Monday 6 May 2019 inclusive. This has impacted a subset of fund ranges under DST's administration, but please note that not all fund managers are treating this the same way:  

Last valuation point today (Thursday 25 April 2019) - Any trades instructed after the VP of 25th April 2019 will be placed but will go forward to the next available valuation point of Tuesday 7th May 2019:
T Rowe Price - https://www.dstdistributorportal.com/news/entry/t-rowe-price-japan-golden-week
Aberdeen Standard Investments - https://www.dstdistributorportal.com/news/entry/asi-japan-golden-week
Quilter Investors - https://www.dstdistributorportal.com/news/entry/quilter-investors-japan-golden-week
JP Morgan - https://www.dstdistributorportal.com/news/entry/j-p-morgan-japan-golden-week
Invesco - https://www.dstdistributorportal.com/news/entry/invesco-golden-week-tokyo-stock-exchange-closure
Janus Henderson - https://www.dstdistributorportal.com/news/entry/janus-henderson-japan-golden-week

Last valuation point today (Friday 26 April 2019) - Any trades instructed after 26th April 2019 12:00 pm VP will be placed but will go forward to the next available valuation point of Tuesday 7th May 2019.
Neptune - https://www.dstdistributorportal.com/news/entry/Neptune-japan-golden-week  

Last valuation point today (Thursday 25 April 2019) – After today’s VP’s, no trades will be able to be placed and any instructions will be rejected for the impacted funds. STP Rejections will go back via EMX and Calastone at the time the trade is submitted during the restriction period between 12:01 pm on Thursday 25 April 2019 and 8:00 am Tuesday 7 May 2019. Please review the below news stories for funds applicable to this change:

Columbia Threadneedle - https://www.dstdistributorportal.com/news/entry/columbia-threadneedle-japan-golden-week-japan-fund-dealing-rejections
M&G - https://www.dstdistributorportal.com/news/entry/m-g-japan-golden-week
Man GLG - https://www.dstdistributorportal.com/news/entry/man-glg-change-of-administration