No problem. Your IN LTCH, assuming you are a resident of IN, covers you for CC and OC. It is considered the same as a Michigan CPL (Concealed Pistol License=LTCH for all purposes but purchase of a handgun)
The nice thing about OC w/ a LTCH in Michigan, you may carry
openly almost anywhere except a courtroom and Detroit Casinos. (FED law and Fed Building still apply, as do sterile areas of airport.
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“…My office has contacted the Michigan State Police legislative liaison and has received some answers to share with you. According to the liaison, it is legal to openly carry a firearm in a "Pistol Free Zone" if you are a licensed CPL holder. I was advised that your information was correct that MCL 28.425o and MCL 750-234d permit this activity. I was informed that there was no other additional relevant laws regarding this matter…” Michael A Prusi, State Senator 38th District
“Your analysis is correct. Non-CPL pistol free zones do not apply to CPL holders. The CPL pistol free zones only apply to CPL holders carrying a concealed pistol. Therefore, a CPL holder may openly carry a pistol in Michigan's pistol free zones.” Sgt. Thomas Deasy, Michigan State Police Executive Resource Section
see:
http://www.miopencarry.org/moc_files/brochure.pdf