@roch
That doesn’t necessarily answer the question, especially for a plug-in that has data through most of the wp_* tables. Events in SportsPress populate data through wp_postmeta, wp_posts, and wp_terms to name a few that are all cross-referenced.
Both @ale_mol and @brianstoiber are asking the same question.
A calendar link won’t transfer the built-in information the plugin uses, which ties to player, team stats and league tables.
If there was an export option for any of the data in SportsPress it would make this entire process much simpler.
The only solution that I’ve found is a destructive rebuild of the entire WP database.