Day of travel to a business conference and the return are considered business days so travel expenses are deductible.
Also if you have business meetings on Friday and Monday you can count the weekends as business days....all on the road expenses for the weekends are deductible if sandwiched in between business meetings.
As stated in previous posts I am not a tax attorney. These are short tips(summaries) I'm sharing with you from the tax book by Botkin.
Always consult a CPA or tax consultant for advise.