Performing salaah on a plane while sitting

Q: A person read salaah on the plane. Due to severe turbulence and short time for asr and the flight crew not allowing him to stand, the asr Salaah was read sitting on the seat not facing qiblah. 

I understand that one will have to repeat this salaah standing up afterwards. The time of asr ended and maghrib time came in. The flight now landed. 

1. Will the Asr Salaah be regarded as invalid and Qadha have to be read (fardh not done at all), or was it a valid adaa but necessary (waajib) to repeat the salah? 

2. If one is saahib e tarteeb and the next salaah comes (e.g. maghrib comes in), will one read the next salaah (maghrib) first, or repeat the salah in question (asr) first? 

3. If someone in the family did not have wudhu, and neither had anything to make tayammum with, then performed the Asr Salaah sitting on the seat in that state, will the masla change in both questions 1 and 2?

Doing the decor for a birthday party

Q: I recently started learning how to do balloon decorations and someone asked me to make some decor for their birthday party and my mom agreed without me giving consent first. 

I am well aware that we are not allowed to celebrate birthdays and I do NOT intend on celebrating nor attending this birthday party. Am I allowed to make the balloon decorations for this person with the intention of not celebrating with them?

Women going around to give bayaans

Q: A very concerning matter facing us here in the UK and I believe in many countries. The matter is that some ladies have opened a door of going around place to place to give bayaans. They become speakers and attend as well as put together conferences where they attract audiences based on their skills in language and the ability to deliver an entertaining talk. 

Some of them podcast on social media for everyone to listen to. Men have full access to listen to them live or to the saved video recordings. Some of them do so in niqaab and some without. 

This oratory by these women has become very appealing to young girls who see this as a goal to achieve in their spiritual growth. 

These women openly encourage other ladies to do the same and as a result there are teams of such ladies going around almost like shaikh and mureeds. They attract big followings and people are being misled to believe that the sahabiyaat use to also lecture and advise men in the matters of deen. 

They lure young girls with the snare of online quran classes and then lead them to the same desire to be lecturers and hold their own conferences. This has also become a business in the name of deeni efforts. This looks very attractive to modern muslim families that their wives and daughters are getting some kind of exposure to deeni knowledge and it is also very convenient in keeping them busy and as it is said rather keep them off the streets. 

Women and girls are also attracted through emotional activities of social and welfare work. In most cases the harms are not immediately apparent. 

Should innocent families be warned about this? To what extent should women be allowed to have these kind of lecture conferences? How should people be made aware ? Will appreciate your guidance on this matter