Any Plugin for a travel agencya website and contact form?

Hi everyone! I have a travel agency and I use contact form to make the reservations. As you would know, every trip has his own starting days, so in days field I have to put somethinkg like it in contact form:

Starting day: [select* menu-date “25/07/2016 (Monday)” “01/08/2016 (Monday)” “09/08/2016 (Thursday)” etc.

The problem is that, when dates are obsolete I have to edit it manually and, keeping in mind I have like 40 trips, it is like a pain in the ass.

I have tried to use the new data picker of contact form, but it seems you can define exact days with it (I mean, every 7 days, 3 days, etc.) not something irregular, like monday, then thursday etc.)

So, It ther’es any visual date plugin for contact form that you can define every starting days and that hide months when it is already happened?

Thanks a lot!