I was looking forward to ISPEC2021 as it was a conference with international participants. The conference was important to join as I could hear different presentations and different people's ideas on my research field.
The conference was held one hour later than JST, so it was easy to apply for the conference, but I felt that it was a bit hard to start at 10:00 a.m on Sunday morning.
Many of the presentations at the conference were not easy to understand, even in the same field of lattice (Efficient Construction of Public-key Matrices in Lattice-Based Cryptography: Chaos and Strikes Again). However, there were only two presentations that I understood, and they were very interesting.