Anyone can join in any time - the more the merrier because you can always do work on anything that has already been called and mark it off when you are done.

Also if you are going to miss a day or serveral because you are traveling but you want to play on those days you can pick for yourself (maybe just close your eyes and pick a spot on the card at random) - as long as you keep it random we'll call any BINGO you get just as valid as if you were doing all the regular draws, then when you go back to playing with everyone else if the activity you happen to pick is called just go back and check the day you missed and do that one instead.

One last thing, if you are looking for the picks of the day I'll be adding them at the top of the first post so you can find them quickly when you open the thread, then I'll be keeping a list of previous calls on the second post so you can check to see what you've missed if you need to see any day beside the current one.
-Val