Based on proximity to the conference location we suggest the following hotels:

Santa Luzia Art Hotel:         
Hotel da Oliveira:              
Hotel Toural:                        
Guimarães Boutique Hotel: 
Stay Hotel Guimarães Centro:
Hotel de Guimarães:           
Hotel Pousada Guimarães: 

You can find an exhaustive list of hotels and accommodation sites at:
As a general recommendation, the hotels located in the city centre are preferable for easier access to the meeting venue and city sightseeing.

Some recommended hotels in Guimarães: