The best alternatives to Guestboard are Partiful, Eventbot, and Allcal. If these 3 options don't work for you, we've listed a few more alternatives below.
Eventbot lets you create events directly in Slack, no external apps needed! Get more RSVPs by putting your event in Slack - and use Eventbot to keep your event from getting lost in the scroll back. Eventbot hel...
The Amsterdam based app designed for meeting people face to face in a matter of minutes. You only have 15 minutes of chat time once you connect with someone nearby before you meet IRL.
Sciety is a platform that allows anyone to organise events for free! Create private groups, host multiple events, and find people that want to connect. Don't see a sciety that you want? Why don't you create it!