Maa Tara saadhna question

Hi i am currently doing Maa Tara sadhna given by Shri Rajarshi Nandy. I have completed 6 thirsdays, now on 12th Thursday i need to travel that week.. basically i can do the saadhna on 12th thursday but i will be on a completely different state and on a office trip. I can do the saadhna but fasting will be next to impossible as i have my close collegue birthday and overall office gathering on that 12th thirsday. Till now i’ve done water fast and this situation on 12th thursday is making me worry a lot. I don’t think i can skip one thursday as it’s allowed only on birth or d** in family. What to do now ? Can i skip fasting and do the saadhna only or there is any another way.. please help your fellow Saadhak