Can an employer force you to participate in charity events?

This is an employment question, not immigration.

Somewhat unusual but the inquiry may be a concern you could become a public charge. Provide what is asked for.

Can a start a single member LLC with an E1 dependent visa and EAD?

Your EAD permits you to work, even for an LLC.

My niece is only 17 how do i apply for a visitors Visa for her?

She must apply and convince the US Consulate's officer of her intent to return to her hoe after the visit. You should get legal assistance for...

Can my parents who are here on visa cancel my visa even if I’m over the age of 18?

US government issues and revokes visas, not one's parents.

Have proof of all addresses and bring this up at your interview and tell the truth.

Termination of employment is when the 60 day grace period begins to run.

Can I apply for DACA?

You fail to meet the continuous residence requirement so no you are unfortunately not eligible.

I need to find out information about 212 a5 refusal on a Cr1 ?

You to see the reason for the denial and then consider hiring legal assistance to see if the denial can be overcome.

What are my option to stay legally in the US?

Ask your DSO to guide you. Curricular Practical Training (CPT) allows you to work while getting school credit.