Briefly, at first

1.  from Jonathan:   I've heard many people say after something has not happened: "It wasn't meant to be". Is this really true? Was it not meant to be? Or on the flip too, when people say; "It was obviously meant to be".  I'm not sure how to answer people who ask me about fate and destiny.

First off, fatalism, the stance that our lives are beforehand set in stone, is not set in stone, or God repenting of the destruction of Nineveh in the book of Jonah, based on the contrition of the Ninevehites would not have happened. 

If what we do has no effect then that raises the questions of why pray, why preach if people will or will not believe is already determined. 

There is destiny, and that is the consequences of our actions, whether for good or for ill.

2.  from David: Could a congregation Biblically justify setting parameters by which "membership" is determined?  For example, someone decides one Sunday to worship with a particular congregation. After a few weeks, the elders of the church speak to this person and it is determined that they have already obeyed the gospel as God has commanded. The person expresses their intentions to worship with that congregation for the foreseeable future.  When should that person be considered a member? Immediately? Should there be specific parameters set other than obedience to the gospel? Should the elders meet to decide to let this person claim membership? 

Well according to Acts 2:41 the 3,000 saved there were added to their number, and that was immediate. With that they did what was laid out in the remains of the chapter. So if they are able to worship there, by that I'm assuming taking part in the Lord's Supper, then are they not a part of the church there. If they have 'devoted themselves' to that assembly then what is restricting them from being 'members'. Now parameters for being able to partake of the Lord's Supper is another question.

3.  from Steve: 

a. Is it sinful for women to cut their hair (based upon 1 Corinthians 11)

It is according to that scripture a disgrace, certainly, but sin? Well according to James, if someone knows what us good and does it not, to them it is sin. So is long hair a good thing, it was in that culture a sign of subordination. So I think it would be fair to say having the right view of biblical authority is what this is about. Right headship is key, and if that is lived out then length of hair is less so. But short hair may be a sign to check your attitude, if the woman is above the man, could that be the sin. 

b. Is it sinful to have Bible classes

Is it wrong to discuss the Bible in people's homes, as long as what is being taught is in line with sound doctrine, surely not. But the elders should be informed so they can refute if anything is taught in error. On a side point, if a bible class sinful, then is discussing it on a online bible study unsinful.

4.  from Bob: What should be used to define "worship"?  Could some, or all, of the '5 acts of worship' be omitted and the even still be called worship?  Does worship only happen on Sunday, or can it be other times?  Some use the Wednesday night Bible study as an example of worship that incorporates on some of the '5 acts'.

Worship: Homage rendered to God which it is sinful (idolatry) to render to any created being (Ex. 34:14; Isa. 2:8). Such worship was refused by Peter (Acts 10:25, 26) and by an angel (Rev. 22:8, 9). (Easton's Bible Dictionary)

Technically yes you can worship without all five, are you really going to say it is not a worship meeting if the collection bag is not passed round, for example. But can you imagine a worship meeting without one of them. I guess it's like baking a cake can be done without sugar, but don't ask me to eat it.

As to Sunday, I'll let you debate the meaning of Romans 14:5-6.

5.  from Deborah: In Acts 22:4 Paul says he persecuted "this way".  Is this where "The Way" church came from?  At what point did the word 'way' change from a direction (adverb) to a proper noun?

ὁδός the Greek word for way here, is road, or means of travel. So wasn't and can't be a verb. As a noun is a big jump to make it a proper noun. As to 'The Way' church, I have never heard of them. The name of who they meet to is what matters not the name of your church.