Am I able to get a Blepharoplasty surgery done if I have a hardened chalazion?

Yes, one can have blepharoplasty even if have an old stable chalazion still present. Furthermore, the chalazion can be removed at the same time is the blepharoplasty in most instances.

Many of these resolve with a kenalog injection.  For that reason, I would start with this nonsurgical treatment. Once the chalazia have resolved, then blepharoplasty is appropriate.  If the chalazia does not resolve with kenalog, chalazia surgery is appropriate.  I the past 20 years very few chalazia have needed to be removed with surgery.  I agree with others to take care of the chalazia first.

Get the chalazions removed before  you do a blepharoplasty.  These are nodules of chronic inflammation.  If you do an eyelid surgery the chalazion may get more inflamed and possibly infected while you are healing from the bleph.   You also don't want to have a cosmetic surgery done and then have a chalazion still present in the lid.