I received few similar enquiries regarding to the Tomoko Tsukui' workshop.
1) it is to given the comfortable environement to the attendees participating in the workshop, it is to fully-respect to the artist and the attendees......
it is strictly prohibited for other visitors in & out during the day from 10:30am-7:00pm of May.24 & May.25 (please do considerate to the other office(s)' people are working during the office hours)
2) the exhibition of Tomoko Tsukui starts from May.24
so it is allowed for all the attendees participating in her workshop to have an advance purchase of her exhibit items with side products before and after the workshop.