🇨🇦Canada slawomir
Following up on pcambra, wanted to add that doing an upgrade from D6 to D10 on the module might be harder than starting anew - definitely start by looking at something event_planner suggested by the user.
I've started with D7, and even many of its modules were only PHP5 compatible until the last two-three years. Between PHP now supported starting v8 and the changes in Drupal, an "upgrade" of the meetings module seems... unlikely.
Here for any questions you might have.