Honestly for me I have throw aways. If I am traveling for such a short period while trying to maintain an exercise routine & a casual meetup I will bring an older pair of either the casual or running shoe I can consider throw aways.
I will travel to the site wearing 1 of the 3 pairs of shoes and return with 2 of the 3 pairs (1 packed) while leave one behind. The scenario I described happens to me about 2-3 times a year so this is not a financial hardship.