If you're traveling to Ujjain here I am writing a blog giving guidance in planning your journey to Shri Mahakaleshwar.
First of all,my guidance about how you should travel if you are from the North India or west india then the best way to go to Ujjain is to either go by train directly from your place or if you want to fly it's the best to fly to Indore and take a cab it's just one hour away from there.
Now if you're visiting Ujjain for temple visits, you should carry kind of clothes especially in the summer and autumn weather that are comfortable like kurta pyjama, kurti pants/leggings, T shirt and a track pants and if you want to wear traditional then kurta Salwar or kurta palazzo and boys can wear kurta Jeans/Pyjama. Footwear you must carry are nice chappals or slip ons with you because for temples we have to take them off after every some time. If you have sensitive feet and they ache after walking then invest in slippers by sports brand.
It's generally hard to get rooms so prior booking is the best idea. Look for rooms near the temple so you may easily go for darshans.
People start standing in queues from 12 in the midnight so they may sit in the front rows for Aarti. However, I figured out there are gates and if you manage to arrange entry from gate no. 5. You have bright chances for sitting in the starting rows. Pandit ji s are generally aware of these systems and they charge you separately for arranging such entries. Unfair though but until temple management grips it better, there is no way out. I have heard there are VIP passes too that make you sit too close to the sanctum sanctorum.
Now, about the Saree and Dhoti as a compulsory dress debate. As per meeting held on 9th June 2022,
It is compulsory if you are going to go to the sanctum sanctorum. This depends on the pass you buy and if you are doing Abhishek.
You may wear suits or saree if you are just going to sit and watch Aarti. They have relaxed it.
Prasad is available outside the temple.
For meals there are plenty of places to go to. Apna sweets, ghanta wala are two which are crowded but there are others also. In breakfast, generally poha, sabudana khichadi, samosa, kachori and jalebi are there. Otherwise north indian food is also very easily available.
To go to other temples one can either take an auto tour or cab tour. Both are very good choices. If you take an auto just ensure that it takes you also to Shri Chitaman Ganesh Temple. As it is far, sometimes auto walas may not take you there.
May you have a blessed trip. JAI SHRI MAHAKAL