In order to ensure the proper operation of information technology system, the Cultural Affairs Bureau (IC, from the Portuguese acronym) will perform maintenance and upgrades on the websites from 10am to 10pm on 10 May (Tuesday) and 11 May (Wednesday). Services on several websites will be unavailable intermittently, including websites of the Cultural Affairs Bureau, Macao International Music Festival, Macao Arts Festival, Macao Young Musicians Competition, Parade Through Macao, Latin City, Macao Orchestra, Macao Chinese Orchestra, Research and Publications, other subordinate websites of IC and mobile web, among others. Besides, the IC Activity Registration System will also be unavailable in the above mentioned time. Normal service will resume once the maintenance is completed on the websites.