For some places, the local communties have set up "last minute hosting" groups where you might be able to find hosts on short notice. To find these groups, go to the groups page, enter the name of the place (e.g. a city) where you need a host in the search field, and click on "Search". Go through the list of results and if there is a last minute group for that place, join the group and post a new message there.
Alternatively, just regularly search for members in that location (by using the find members page) and check whether some members have included their phone number or Instant Messenger contacts in their profiles. If they have, you can contact them and ask them if they could host you on short notice or help you find another solution. However, please understand if some members do not feel comfortable with hosting somebody on very short notice.
