Pls help to check my grammar.

Mary will get married on 18 March. To congratulate her, we would like to get her a wedding gift. Please feel free to contribute and send in on or before next Tue.

and send back to me

We would like to buy a wedding gift to celebrate Mary's marrying on 18 March.

Please to join and reply us before next Tue.

Mary is getting married on 18 March, and we would like to buy her a wedding gift. Please feel free to come up with suggestions for the gift and let us (or me) know before next Tuesday.

Mary is getting married on 18 March and we would like to get her a wedding gift. Please feel free to contribute and pass it back on before next Tuesday.

我不太明白最後一句，pass it back on 是指回覆你嗎？如果是回覆你的話，那句應該是：Please feel free to contribute and get back to me before next Tuesday.