shall S1 W1 /ʃəl; strong ʃæl/ modal verb (negative short form shan’t)
[Language: Old English; Origin: sceal]

1. shall I/we ... ? spoken used to make a suggestion, or ask a question that you want the other person to decide about:
Shall I open the window?
Shall we say 6 o'clock, then?
What shall I get for dinner?

2. I/we shall especially British English formal used to say what you will do in the future:
We shall be away next week.
I shall have to be careful.
I’ve never liked her and I never shall.
We shall have finished by Friday.

3. formal or old-fashioned used to emphasize that something will definitely happen, or that you are determined that something should happen:
The truth shall make you free.
I said you could go, and so you shall.

4. formal used in official documents to state an order, law, promise etc:
All payments shall be made in cash.

[TahlilGaran] Dictionary of Contemporary English ▲

shall
modal verb
BAD: The next meeting shall take place in Vienna.
GOOD: The next meeting will take place in Vienna.

Usage Note:
For future reference, use will with the second and third person: 'I'm confident you will not be disappointed.' 'If we don't hurry, the match will have started.' Use will/shall with the first person (I/we ): 'This time next week I will/shall be in Florence.' 'I'm sure we will/shall be seeing each other again.'

[TahlilGaran] Dictionary of Common Errors ▲