Continuing on from Silkierabbit's post mentioning Look Good, Feel Better, I would only advise doing one of those if you are feeling well.
I went to one and was overwhelmed. The speed and pressure to get through it all was rather stressful, as was trying to open things in plastic with peripheral neuropathy etc. They tried to help us, but lots of us were struggling to keep up.
Then at the end the man told us all to avoid all sugar and make sure we drink lots of water with lemon every day. That was awful, I hate unwanted idiotic dietary advice from non-medical professionals.
Then he asked if anyone wanted a window open. I said yes (immune suppressed) and he joked about hot flushes and another of their team proceeded to fan right in my face. I ignored it and looked away to stop the air irritating my eyes. He assumed I was on oestrogen blockers (I am not).
The workshop was quite long without a break, so again only take part when you feel strong enough.
On the other hand, they tried really hard to welcome us and each participant received a free bag of make up. They tried to match skin tone, and when that hadn't worked for one of the group they quickly solved it in a nice way.
Overall, it's a lovely thing they offer, but be prepared for a very fast pace without a break.