Cant play event quest if play offline. Also playing alone is tough unless you really are a pro hunter.
Guess you never played the base game before?

If you are referring to the commemoration pack for the Osaka MH Festa event that was released, you'll be getting:

- Demon Powder x 20
- Well-done Steak x 25
- Whetfish Fin+ x 20
- Dust of Life x 20
- Expert Jewel x 1

Probably you've received it after closing the Login Bonus window. I've gotten mine. 

Depends on what your main weapon as. Empress weapons are good if you combine with Xeno for long white sharpness.

Geralt's side quest is only good if you want to get his full armor set which is useful for Dualblades/melee weapons. If you can keep the Pukei-pukei alive for the entire battle, you get an attack jewel.

Your HR and MR are 2 separate levels. Even if you do MR quests, you still get xp for HR. Nothing to worry about.

Never do that one. Also I won't be able to do Safi as well.

I am level 63 MR. I just didn't buy PSN just to play multiplayer

Looking for a group for Alatreon.  Haven't had any luck yesterday with pick up groups.

Edit:  Nvm, didn't know it was dps (element) check. Managed to defeat it after upgrading one of the elements with decos.

Join those with 2x Ice or 2x Fire weapon players instead of 3x Dragon 1x Ice/Fire. Exception with those using Alatreon Dominator LBG.

Or go with all four players with Ice or Fire elements.  This strategy you must break both it's horns during the first second and second Dragon stages.

You'll do fine with Health Boost Level 3 and Blight Resistance Level 3 for comfort. Everything else on DPS.

If BL 3 is not possible, then prepare Nulberries. Other than that, you might want to bring your utility tool: Health Boost + Astera Jerky (can be bought from the Provisions). Usually the duration will last around 5 to 7 mins in a 4P fight.