The very first time I attended a Getaway the event was kicked off by a tremendous singaround. When my turn came I played and sang a song I had done for decades. But somewhere amidst the chorus I couldn't remember a chord change and couldn't proceed. So I switched to a different song. Nobody seemed to mind.

Since these events I have evolved toward printing out lyrics that I have put into bold typeface and large font with brightly colored chord notations and some arrangement notes. There are still some songs from years gone by that I still manage without written lyrics, etc.; but for the most part, what with being elderly and all, I need to rely on them.

Back when my memory was considerably better, I found that writing down the lyrics and memorizing them without the music worked well for me. As I sang the song I could picture the words. I don't know if this will work for anyone else but may be worth a try.