My fav 1yr old toys where,
activity table
bead frame
sand/water table
puzzles
ride on
pull/ push toys
We did BBQ & for DS1 I did Pooh Bear theme, but that was more for me, ha ha, we had mainly family for that one & not many kids.
If it is more of a kids party (littlies) then I would go with more snacks & play things, love the bubble idea , but keep it simple or you will have heaps of grumpy kids.
Have fun & congrats on make to the 1yr mark