What are side riser seats? Are they bleacher seats? Is there access to someone with a walker?

simple,plain, folding - type seats; & Yes...♿ handicap accomadations

Seats without folding arms you just sit and yes ♿ wheelchair access

Yes

They are just regular folding chairs, and yes there is access to people who are using walkers and wheelchairs .

Yup

Yes there is!