I would like to argue for increasing the ranking towards A. Last 5 years the acceptance rate stands around 25 % (https://mobilehci.acm.org/sc/historical.html). People recognized in the area are regularly publishing here. Regards Zdenek Mikovec

The conference is routinely attended by top people in the area:

I believe the conference should be assigned rank A. According to Google Scholar Metrics MobileHCI is above many other conferences which have been assigned A rank by ERA/CORE, such as International Conference on Intelligent User Interfaces (IUI). The acceptance rate has been below 25% in the past many years. It was 23% in 2016 and 20% in 2017. Top people in the field of Human Computer Interaction regularly publish in MobileHCI. This conference is sponsored by SIGCHI. They also have grants for postgrad students to attend the conference.

Rating:

This conference is welcoming to new attendees such as postgraduate students:
Referees for this conference provide high quality detailed feedback:
The conference program facilitates networking:
There is a culture of interaction and feedback following presentations:
The conference is routinely attended by top people in the area:
Overall, attending this conference is worthwhile:

I agree with the comments above Mobile HCI should be ranked A. This conference has had an acceptance rate of around 25% consistently for the last 5 years, including this year e.g. 2018. It is a SIGCHI Conference and has consistently top rated and cited papers. It has grants for students to attend and has grants for increasing diversity.

Rating:

This conference is welcoming to new attendees such as postgraduate students:
Referees for this conference provide high quality detailed feedback:
The conference program facilitates networking:
There is a culture of interaction and feedback following presentations:
The conference is routinely attended by top people in the area:
Overall, attending this conference is worthwhile:

The ranking for this conference should be increased to A. It is already ranked A2 by Qualis. Moreover, it has a very competitive acceptance rate for the past few years. 26.4% in 2019, 23% in 2018, 20% in 2017, 24% in 2016. This is much better than any other B ranked conference, e.g. ICMI is ranked B and it has had an acceptance rate in 40% for the past 5 years. IUI and UIST are both ranked A and they both have similar acceptance rates, i.e. in 20%s.

This conference is welcoming to new attendees such as postgraduate students:
Referees for this conference provide high quality detailed feedback:
The conference program facilitates networking:
There is a culture of interaction and feedback following presentations:
The conference is routinely attended by top people in the area:
Overall, attending this conference is worthwhile: