*Arrangements* (Travel arrangements) is the word you need.

>Could I please return to you about attending your ceremony only after you decide on its location? I ask because **travel arrangements** might prove difficult to book once I learn about the location at a later date.


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I can't find an easy source of a definition of 'travel arrangements' but here's a quote from Wikipedia.
>In addition to dealing with ordinary tourists most travel agencies have a separate department devoted to making travel arrangements for business travelers and some travel agencies specialize in commercial and business travel only.

<sub>Wikipedia contributors, "Travel agency," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Travel_agency&oldid=633727772 (accessed November 18, 2014).</sub>