Here are the direct hotel reservation links:
Courtyard Southfield
https://www.marriott.com/meeting-event-hotels/group-corporate-travel/groupCorp.mi?resLinkData=Wayne%20State%20University%5EDTWSF%60WAYWAYA%6092.00%60USD%60false%606%6010/19/18%6010/22/18%6009/21/818&app=resvlink&stop_mobi=yes
Dearborn Holiday Inn
https://www.hiexpress.com/redirect?path=event-facilities&brandCode=EX&localeCode=en®ionCode=1&hotelCode=DTTDE&_PMID=99801505&GPC=WSU&viewfullsite=true
These deadlines are set in Tabroom for technical purposes. Always consult the invitation or tournament notices for official policies about deadlines and procedures.