Nikaah & Marriage Issues

Q: Is it okay to make engagement posters on the engagement of a couple? 

For example: We are pleased to announce the proposal of:

Groom 

Bride 

Please advise.

Q: Is it appropriate to read a qiraat at a walimah venue where women are generally not dressed correctly despite being in a separate venue (from the men). 

Any additional advice for these kinds of occasions will be highly appreciated

Q: I'm in the 5th month of my first pregnancy. The 4 heart chambers of the baby can not be seen and the doctor says that the baby has a big hole in the heart. The baby can die or will face multiple surgeries and may survive or not. We are not sure what to do and we don't have this much cash. Can I terminate the pregnancy or not?

Q: If one's husband has made nikaah without telling her and she found out about 3 months later. Her husband did not consummate the marriage and after consulting with his seniors, he regrets what he had done. However he is afraid to divorce the second wife due to backlash. The first wife wants to make dua that he leaves his second wife since he hasn't caused her to to become pregnant which will further complicate things. 

My question is, is one allowed to make a dua as such... "Oh my beloved Allah you create a good excuse for my husband to leave his second nikaah with aafiyah and you make it such that she finds a better spouse for her thereafter". 

Will this kind of dua be allowed?

Q: Can a woman have relations with her husband if she has istihaatha?

Q: Is it permissible to spend money on décor on the occasion of the waleemah? People spend a lot of money on flowers and draping the stage etc. Does this fall under israaf or is it permissible to do this if a person has the money and is not borrowing money to do it?

Q: Is it permissible for children to throw flowers on the bride on the occasion of nikaah? 

Q: If a boy texts message a girl saying, "Do you accept me in nikkah" and the girl texts back,"yes" and then the boy texts, "same here", and during this there is no witness on the girl's side but the girl does not know if there were witnesses on the boy's side or not. Is the nikaah valid?

Q: Is it a sin on the part of a man not to provide his wife and family with their basic needs including food, clothing, self-care etc.? 

I have read your answers on his obligations to his family. What is the harms if he fails to fulfill these obligations.

Q: If a husband asks his wife for sexual relations but he hasn't performed salaah, example: Asr salaah and the time is late, i.e. about 20 mins left, and she asks him to perform his salaah first, does she get sin or is she valid for making him perform his salaah first?