The Allegiance Quest Packages are no longer available as we are now in a new Season and Bungie decided to stop these packages as these were mainly bound to the content in Season of the Drifter. As for the Daily Challenge, although they say Daily, they are not really Daily, they are on a four day rotation and each day a different Daily Challenge refreshes. I don't know the exact order, but as an example: On Tuesday, the Daily Strike Challenge refreshes. You then have four days to complete it before the next refresh for that Challenge comes and you lose out on a reward if you don't do it. On Wednesday, Crucible refreshes, on Thursday Gambit and on Friday the Heroic Adventure. Then back to the Strike Challenge. For the free engram, that one is only available once per Season for completing the 150 kill Bounty that Tess normally offers at the beginning of a season (and sometimes events). Apart from that, you don't get free Engrams, only the Well Rested Buff at the Weekly Reset which gives you increased XP for the first 3 Engrams for that character.