How can I use htaccess to redirect paths with a wildcard character

You could use the RedirectMatch directive of mod_alias:

RedirectMatch 301 ^/calendar-for-groups/.*$ http://www.mywebsite.com/events

Or with mod_rewrite:

RewriteRule ^calendar-for-groups/ http://www.mywebsite.com/events [R=301,L]

You can do with a few rewrite rules:

RewriteEngine on
RewriteRule ^calendar-for-groups/(.*)   /events [R=301,L]

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