There are lots of accommodation options for all budgets in Birmingham City Centre, bookable for example through booking.com, a short train (2 stations from New Street) or a short bus / taxi / Uber ride from the university.
The University runs the Edgbaston Park hotel, which is on campus, a 5 minute walk from the venues (https://www.edgbastonparkhotel.com) - unfortunately it looks expensive at the time of the meeting.
Please contact the organisers if you need any further advice.