Depending on the exact date you may also have Hindus and Christians fasting.
Some Christians may also be abstaining from meat.
Some Catholics attend an early mass during Lent, often at 6am so they might like a breakfast in a bag to come back to.
Purim is also in March this year.
Favardigan and Ava Mah Parab are also in March
Buddha Shakyamuni’s birthday is in early April.
So if you have a quiet / prayer room make sure it is available to all.
Depending on the hotel it might be worth asking if they can provide a fridge in some or all of the rooms (if they don't already have one there) Then people can take snacks and store them. Or have the hotel put a selection in the fridges instead of providing them in the day. Breakfast can then be delivered the night before for people who are fasting or just don't want to go down to a hotel breakfast.
Even hotels that do not normally have fridges in the room usually have some that can be booked for medical reasons.
Once you have emails I'd send a form asking for any information relevant information for accommodations eg dietary, medical, cultural etc.
Ask the hotel to provide fruit as a snack, most seen to think you need biscuits with coffee but fruit can be eaten by most people and can be kept in the fridge.
Can you tell my favorite unit to teach was 'Equality and Diversity'?