请回答下列英语问题。

1an email . 2with . 3.gathering details(这个不确定，只有了俩空) 1 everyone who takes part in the activity Will pay for himself. 1 no,members stranged to each other can make friends and talk .2. the reading is an ad to recruit a volonteer for outdoor acivities teling some informatin obout the club and how to join it

you should let us know in order to know how many people will come at that weekend. 这句话是病句 (in order to know) typo?

1. the number, 或 the number of people, or the number of ppl coming to the gathering

2. with or without 

3. gathering details

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4. there is no mentioning of costs or expenses.

5. no, anyone can join the gathering

6. advertising for a gathering online