Finding in-person publishing classes can be a challenge, as is fitting them into your busy schedule. Fortunately, a number of organizations make recordings of their webinars freely available. Take a look at some of these valuable offerings:

Crossref
https://www.crossref.org/webinars/

Library Publishing Coalition
https://www.librarypublishing.org/resources/webinars

Open Access Scholarly Publishing Association
https://oaspa.org/information-resources/oaspa-webinars/

PKP (watch for more later this year)
https://www.youtube.com/user/PublicKnowledgeProj/

OASPA and PKP also make recordings of many of their conference presentations available online:

Conference on Open Access Scholarly Publishing (scroll down to the bottom of the page, and select the Records link for each year)
https://oaspa.org/conference/

PKP International Scholarly Publishing Conferences (select the year, and then choose the Video links on the Program)
https://pkp.sfu.ca/conferences

If you know of other helpful publishing webinar collections, please share them in the comments below.